50278 + Interview Questions in Physics Page 131 InterviewSolution

6501.	A block of mass m placed on a smooth floor is connected to a fixed support with the help of a spring of stiffness k. It is pulled by a rope as shown in the figure. Tension force T of the rope is increased gradually without changing its direction until the block losses contact from the floor. The increase in rope tension T is so gradual that acceleration in the block can be neglected. What is the extension in the spring, when the block losses contact from the floor?
Answer» A block of mass $m$ placed on a smooth floor is connected to a fixed support with the help of a spring of stiffness $k$ . It is pulled by a rope as shown in the figure. Tension force $T$ of the rope is increased gradually without changing its direction until the block losses contact from the floor. The increase in rope tension $T$ is so gradual that acceleration in the block can be neglected. What is the extension in the spring, when the block losses contact from the floor?

Discussion

6502.	Find the derivative of ax4−bx2+cosx where a,b are fixed non-zero constants.
Answer» Find the derivative of $\frac{a}{x^{4}} - \frac{b}{x^{2}} + cos x$ where $a, b$ are fixed non-zero constants.

Discussion

6503.	In the figure shown, find the angle θ for which the pulling force is μmg where μ is the coefficient of friction between the two surfaces
Answer» In the figure shown, find the angle $θ$ for which the pulling force is $μ m g$ where $μ$ is the coefficient of friction between the two surfaces

Discussion

6504.	A coin is placed on a turntable which is making 40 revolutions per minute. The distance of the coin from the center of the turntable is 3π2 m. The minimum friction coefficient between the turntable and the coin is [Take g=10 m/s2]
Answer» A coin is placed on a turntable which is making $40$ revolutions per minute. The distance of the coin from the center of the turntable is $\frac{3}{π^{2}} m$ . The minimum friction coefficient between the turntable and the coin is [Take $g = 10 {m/s}^{2}$ ]

Discussion

6505.	A1 kg block situated on a rough incline is connected to a spring ofspring constant 100 Nm–1as shown in Fig. 6.17. The block is released from rest with thespring in the unstretched position. The block moves 10 cm down theincline before coming to rest. Find the coefficient of frictionbetween the block and the incline. Assume that the spring has anegligible mass and the pulley is frictionless.
Answer» A 1 kg block situated on a rough incline is connected to a spring of spring constant 100 N m^–1 as shown in Fig. 6.17. The block is released from rest with the spring in the unstretched position. The block moves 10 cm down the incline before coming to rest. Find the coefficient of friction between the block and the incline. Assume that the spring has a negligible mass and the pulley is frictionless.

6505.

A1 kg block situated on a rough incline is connected to a spring ofspring constant 100 Nm–1as shown in Fig. 6.17. The block is released from rest with thespring in the unstretched position. The block moves 10 cm down theincline before coming to rest. Find the coefficient of frictionbetween the block and the incline. Assume that the spring has anegligible mass and the pulley is frictionless.

Answer»

A
1 kg block situated on a rough incline is connected to a spring of
spring constant 100 N
m^–1
as shown in Fig. 6.17. The block is released from rest with the
spring in the unstretched position. The block moves 10 cm down the
incline before coming to rest. Find the coefficient of friction
between the block and the incline. Assume that the spring has a
negligible mass and the pulley is frictionless.

Discussion

6506.	Calculate the force needed to punch a 1.46cm diameter hole in a steel plate is 1.27cm thick. The ultimate shear strength of steel is 345N/m2
Answer» Calculate the force needed to punch a 1.46cm diameter hole in a steel plate is 1.27cm thick. The ultimate shear strength of steel is 345N/m2

Discussion

6507.	The cylindrical tube of a spray pump has a cross-section of 8.0cm2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5mmin–1, what is the speed of ejection of the liquid through the holes?
Answer» The cylindrical tube of a spray pump has a cross-section of $8.0 c m^{2}$ one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is $1.5 m m i n^{- 1}$ , what is the speed of ejection of the liquid through the holes?

Discussion

6508.	The cell of a Field Programmable Gate Array is shown in the figure. It has three 2×1 multiplexers with their select lines G0,G1,G2 and 4 digital signal input lines I0,I1,I2 and I3. The logical function that relates the output O to the select and signal input lines is
Answer» The cell of a Field Programmable Gate Array is shown in the figure. It has three 2 $\times$ 1 multiplexers with their select lines $G_{0}, G_{1}, G_{2}$ and 4 digital signal input lines $I_{0}, I_{1}, I_{2} a n d I_{3}$ . The logical function that relates the output O to the select and signal input lines is

Discussion

6509.	A body moves in straight line and covers first half of the distance with speed 5m/s and second half in two equal halves with speed 4m/s and 3m/s respectively. The average velocity of the body is nearly equal to?
Answer» A body moves in straight line and covers first half of the distance with speed 5m/s and second half in two equal halves with speed 4m/s and 3m/s respectively. The average velocity of the body is nearly equal to?

Discussion

6510.	n moles of a perfect gas undergoes a cyclic process ABCA (see figure) consisting of the following processes -A→B : Isothermal expansion at temperature T so that the volume is doubled from V1 to V2 and pressure changes from P1 to P2.B→C : Isobaric compression at pressure P2 to initial volume V1.C→A : Isochoric change, leading to change of pressure from P2 to P1. Total work done in the complete cycle ABCA is :
Answer» $n$ moles of a perfect gas undergoes a cyclic process $A B C A$ (see figure) consisting of the following processes - $A \to B$ : Isothermal expansion at temperature $T$ so that the volume is doubled from $V_{1}$ to $V_{2}$ and pressure changes from $P_{1}$ to $P_{2}$ . $B \to C$ : Isobaric compression at pressure $P_{2}$ to initial volume $V_{1}$ . $C \to A$ : Isochoric change, leading to change of pressure from $P_{2}$ to $P_{1}$ . Total work done in the complete cycle $A B C A$ is :

Discussion

6511.	You are given several identical resistors each of value 10ohm and each capable of 1A. It is required to make a suitable combination of these two resistances to produce a resistance of 5ohm which can carry a current of4A . The minimum number of resistors required for this job?
Answer» You are given several identical resistors each of value 10ohm and each capable of 1A. It is required to make a suitable combination of these two resistances to produce a resistance of 5ohm which can carry a current of4A . The minimum number of resistors required for this job?

Discussion

6512.	The wave number of energy emitted when electron jumps from fourth orbit to second orbit in hydrogen in 20497 cm−1. The wave number of energy for the same transition in He+ is
Answer» The wave number of energy emitted when electron jumps from fourth orbit to second orbit in hydrogen in 20497 $c m^{- 1}$ . The wave number of energy for the same transition in $H e^{+}$ is

Discussion

6513.	article move with velocity v, for time t and v2A pfor time t2 along a straight line. The magnitude ofits average acceterations
Answer» article move with velocity v, for time t and v2A pfor time t2 along a straight line. The magnitude ofits average acceterations

Discussion

6514.	Light with an average flux of 10 W cm−2 falls on a non-reflecting surface at normal incidence having surface area 40 cm2. The energy received by the surface during time span of 2 minutes is
Answer» Light with an average flux of $10 {W cm}^{- 2}$ falls on a non-reflecting surface at normal incidence having surface area $40 {cm}^{2}$ . The energy received by the surface during time span of $2$ minutes is

Discussion

6515.	In a uniform magnetic field of induction B, a wire in the form of a semicircle of radius r rotes about its diameter of the circle with angular frequency w. The axis of rotation is perpendicular to the magnetic field.if the total resistance of the circuit is R, the mean power generated per period of rotation is?
Answer» In a uniform magnetic field of induction B, a wire in the form of a semicircle of radius r rotes about its diameter of the circle with angular frequency w. The axis of rotation is perpendicular to the magnetic field.if the total resistance of the circuit is R, the mean power generated per period of rotation is?

Discussion

6516.	A block of mass 10 kg slides with velocity of 10 m/s on a rough horizontal surface. It comes to rest after covering a distance of 50 meters. Find the frictional force.
Answer» A block of mass 10 kg slides with velocity of 10 m/s on a rough horizontal surface. It comes to rest after covering a distance of 50 meters. Find the frictional force.

Discussion

6517.	Consider the circuit shown in the figure. Find out the steady-state current in the 4 Ω resistor. Assume the internal resistance of 8 V battery to be negligible.
Answer» Consider the circuit shown in the figure. Find out the steady-state current in the $4 Ω$ resistor. Assume the internal resistance of $8 V$ battery to be negligible.

Discussion

6518.	Frequency of tuning fork = 256 .It wil\ln ot resonate with a fork of frequency 1) 738 2) 256 3)768 4) 51 4)
Answer» Frequency of tuning fork = 256 .It wil\ln ot resonate with a fork of frequency 1) 738 2) 256 3)768 4) 51 4)

Discussion

6519.	Two strings are attached to each other as shown in the figure. The linear mass density of the second string is 16 times that of the first string and the boundary between the two strings is at x=0. The incident wave is given by y=0.01cos(20x−100t). Then, the ratio of amplitude of reflected wave to amplitude of transmitted wave is:[Assume, tension in both the strings is same]
Answer» Two strings are attached to each other as shown in the figure. The linear mass density of the second string is $16$ times that of the first string and the boundary between the two strings is at $x = 0$ . The incident wave is given by $y = 0.01 cos (20 x - 100 t)$ . Then, the ratio of amplitude of reflected wave to amplitude of transmitted wave is: [Assume, tension in both the strings is same]

Discussion

6520.	A particle moves on a straight line as x=4Sin(2πt + π/3). Find acceleration as a function of x
Answer» A particle moves on a straight line as x=4Sin(2πt + π/3). Find acceleration as a function of x

Discussion

6521.	1 μC charge is uniformly distributed on a spherical shell given by equation x2+y2+z2=25. The intensity of electric field at a point P(1,1,2) m is .
Answer» $1 μ C$ charge is uniformly distributed on a spherical shell given by equation $x^{2} + y^{2} + z^{2} = 25$ . The intensity of electric field at a point $P (1, 1, 2) m$ is .

Discussion

6522.	Show that 1C = 3*109Stat c
Answer» Show that 1C = 3*10⁹Stat c

Discussion

6523.	A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:
Answer» A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:

Discussion

6524.	A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends the fundamental frequency that can be excited is ( in Hz ):
Answer» A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends the fundamental frequency that can be excited is ( in Hz ):

Discussion

6525.	11. calculate equivalent weight of NH3 in reaction. N2---NH3 and also for N2
Answer» 11. calculate equivalent weight of NH3 in reaction. N2---NH3 and also for N2

Discussion

6526.	Three charges 2q,-q and -q are located at the vertices of an equilateral triangle . At the central of triangle:A) the field is zero but the potential is non zeroB)the field is non zero but potential is zeroC)both field and potential are zeroD)both field and potential are non-zero
Answer» Three charges 2q,-q and -q are located at the vertices of an equilateral triangle . At the central of triangle: A) the field is zero but the potential is non zero B)the field is non zero but potential is zero C)both field and potential are zero D)both field and potential are non-zero

Discussion

6527.	6. A large flat metal surface has a uniform charge density +A. An electron of mass m and charge e leaves the surface at point P with speed u and returns to it at point Q. Disregard gravity what is the maximum value of PQ.
Answer» 6. A large flat metal surface has a uniform charge density +A. An electron of mass m and charge e leaves the surface at point P with speed u and returns to it at point Q. Disregard gravity what is the maximum value of PQ.

Discussion

6528.	Block P of mass 2 kg slides down the surface and has a speed 20ms at the lowest point, Q where the local radius of curvature is 2 m as shown in the figure. Assuming g=10ms2, the normal force (in N) at Q is (correct to two decimal places).
Answer» Block P of mass 2 kg slides down the surface and has a speed $20 \frac{m}{s}$ at the lowest point, Q where the local radius of curvature is 2 m as shown in the figure. Assuming $g = 10 \frac{m}{s^{2}}$ , the normal force (in N) at Q is (correct to two decimal places).

Discussion

6529.	23.A body is projected at angle 30 degree with the horizontal with momentum p. At its highest point the magnitude of momentum is
Answer» 23.A body is projected at angle 30 degree with the horizontal with momentum p. At its highest point the magnitude of momentum is

Discussion

6530.	By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 20% at a constant temperature?
Answer» By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by $20 %$ at a constant temperature?

Discussion

6531.	An electron falls from rest through a vertical dis†an ce h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical dis†an ce h . The time of fall of the electron, in comparison to time of fall of the proton i
Answer» An electron falls from rest through a vertical dis†an ce h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical dis†an ce h . The time of fall of the electron, in comparison to time of fall of the proton i

Discussion

6532.	Two bar magnets A and B of length 10cm are placed in a plane if the magneticstrength of the both magnets are samethen find the ratio of magnetic momentof bar A to B90rI 10 m
Answer» Two bar magnets A and B of length 10cm are placed in a plane if the magneticstrength of the both magnets are samethen find the ratio of magnetic momentof bar A to B90rI 10 m

Discussion

6533.	When unpolarized beam of light of intensity I° is incident on two polarizer in contact If the angle between the axes of two polarizer is 60^° then the intensity of light inally emerging from the combination i
Answer» When unpolarized beam of light of intensity I° is incident on two polarizer in contact If the angle between the axes of two polarizer is 60^° then the intensity of light inally emerging from the combination i

Discussion

6534.	The units of force ,velocity and energy are 100 dyne,10 cm/s, 500 erg respectively. The units of mass, length,and time are
Answer» The units of force ,velocity and energy are 100 dyne,10 cm/s, 500 erg respectively. The units of mass, length,and time are

Discussion

6535.	What is a propellant?
Answer» What is a propellant?

Discussion

6536.	An air bubble of radius 5mm rises through a vat of syrup at a steady speed of 4mm/s. If the syrup has a density of 1.4×103kg/m3, what is its viscosity?
Answer» An air bubble of radius 5mm rises through a vat of syrup at a steady speed of 4mm/s. If the syrup has a density of $1.4 \times 10^{3} k g / m^{3}$ , what is its viscosity?

Discussion

6537.	The speed of EM wave is:
Answer» The speed of EM wave is:

Discussion

6538.	A particle executes simple harmonic motion between x=−A and x=+A. The time taken for it to go from the mean position O to A/2 is T1 and to go from A/2 to A is T2. Then
Answer» A particle executes simple harmonic motion between $x = - A$ and $x = + A$ . The time taken for it to go from the mean position $O$ to $A / 2$ is $T_{1}$ and to go from $A / 2$ to $A$ is $T_{2}$ . Then

Discussion

6539.	Three identical small balls, each of mass 0.1 g are suspended at one point on the silk thread having a length of 20 cm. What charges should be imparted to the balls for each thread to form an angle of α=30∘ with the vertical ?
Answer» Three identical small balls, each of mass $0.1 g$ are suspended at one point on the silk thread having a length of $20 cm$ . What charges should be imparted to the balls for each thread to form an angle of $α = 30^{\circ}$ with the vertical ?

Discussion

6540.	If a battery is placed between A and B, with what capacitor you can replace the combination of capacitors?
Answer» If a battery is placed between $A$ and $B$ , with what capacitor you can replace the combination of capacitors?

Discussion

6541.	Why is the value of charge on one electron taken as the value of charge while calculating dipole moment ?can there not be any other value ?
Answer» Why is the value of charge on one electron taken as the value of charge while calculating dipole moment ?can there not be any other value ?

Discussion

6542.	A metallic rod of length l is tied to a string of length 2l and made to rotate angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is
Answer» A metallic rod of length l is tied to a string of length 2l and made to rotate angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

6542.

A metallic rod of length l is tied to a string of length 2l and made to rotate angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

Answer»

A metallic rod of length l is tied to a string of length 2l and made to rotate angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

Discussion

6543.	If two tuning forks A and B are sounded together, the number of beats produced per second is 5. The frequency of A is 250Hz. If the load is attached to tuning fork B, again sounded together, the number of beats produced per second is 3. The frequency of B is
Answer» If two tuning forks A and B are sounded together, the number of beats produced per second is 5. The frequency of A is 250Hz. If the load is attached to tuning fork B, again sounded together, the number of beats produced per second is 3. The frequency of B is

Discussion

6544.	33.Consider a cube as shown in the figure-1 with uniformly distributed charge throughout its volume . The electric potential at one of its vertex is Vo. A portion of half the edge length (half the size ) of the original cube is cut and removed as shown in figure- 2. Calculate the potential at point 'P' in the new structure .
Answer» 33.Consider a cube as shown in the figure-1 with uniformly distributed charge throughout its volume . The electric potential at one of its vertex is Vo. A portion of half the edge length (half the size ) of the original cube is cut and removed as shown in figure- 2. Calculate the potential at point 'P' in the new structure .

Discussion

6545.	A straight rod of length L extends form x=a to x=L+a. The gravitational force on a point mass m at x=0 if the mass per unit length of the rod is (A+Bx2), is
Answer» A straight rod of length L extends form x=a to x=L+a. The gravitational force on a point mass m at x=0 if the mass per unit length of the rod is (A+B $x^{2}$ ), is

Discussion

6546.	A uniform magnetic field of magnitude 0.20 T exists in space from east to west. With what speed should a particle of mass 0.010 g and having a charge 1.0×10−5 C be projected from south to north so that it moves with a uniform velocity ?
Answer» A uniform magnetic field of magnitude 0.20 T exists in space from east to west. With what speed should a particle of mass 0.010 g and having a charge $1.0 \times 10^{- 5} C$ be projected from south to north so that it moves with a uniform velocity ?

Discussion

6547.	The difference in the speeds of sound in air at −5∘C, 60 cm pressure of mercury and 30∘C, 75 cm pressure of mercury is (velocity of sound in air at 0∘C is 332 m/s)
Answer» The difference in the speeds of sound in air at $- 5^{\circ} C,$ 60 cm pressure of mercury and $30^{\circ} C,$ 75 cm pressure of mercury is (velocity of sound in air at $0^{\circ} C$ is 332 m/s)

Discussion

6548.	The value of C required for sinusoidal oscillation frequency 1 kHz in the circuit of the figure is
Answer» The value of C required for sinusoidal oscillation frequency 1 kHz in the circuit of the figure is

Discussion

6549.	What is the centripetal force experienced by a bike of weight 800 N moving at a velocity v m/s and bending with an angle of 60∘ with the ground?
Answer» What is the centripetal force experienced by a bike of weight $800 N$ moving at a velocity $v m/s$ and bending with an angle of $60^{\circ}$ with the ground?

Discussion

6550.	Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 300 at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is [IIT-JEE (Screening) 2002]
Answer» Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30⁰ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is [IIT-JEE (Screening) 2002]

6550.

Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 300 at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is [IIT-JEE (Screening) 2002]

Answer»

Two plane mirrors. A and B are aligned parallel to each other, as shown in

the figure. A light ray is incident at an angle of 30⁰ at a point just inside one

end of A. The plane of incidence coincides with the plane of the figure. The

maximum number of times the ray undergoes reflections (including the first

one) before it emerges out is

[IIT-JEE (Screening) 2002]

Discussion

Explore topic-wise InterviewSolutions in .

Find the derivative of ax4−bx2+cosx where a,b are fixed non-zero constants.

In the figure shown, find the angle θ for which the pulling force is μmg where μ is the coefficient of friction between the two surfaces

A coin is placed on a turntable which is making 40 revolutions per minute. The distance of the coin from the center of the turntable is 3π2 m. The minimum friction coefficient between the turntable and the coin is [Take g=10 m/s2]

Calculate the force needed to punch a 1.46cm diameter hole in a steel plate is 1.27cm thick. The ultimate shear strength of steel is 345N/m2

The cylindrical tube of a spray pump has a cross-section of 8.0cm2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5mmin–1, what is the speed of ejection of the liquid through the holes?

The cell of a Field Programmable Gate Array is shown in the figure. It has three 2×1 multiplexers with their select lines G0,G1,G2 and 4 digital signal input lines I0,I1,I2 and I3. The logical function that relates the output O to the select and signal input lines is

A body moves in straight line and covers first half of the distance with speed 5m/s and second half in two equal halves with speed 4m/s and 3m/s respectively. The average velocity of the body is nearly equal to?

You are given several identical resistors each of value 10ohm and each capable of 1A. It is required to make a suitable combination of these two resistances to produce a resistance of 5ohm which can carry a current of4A . The minimum number of resistors required for this job?

The wave number of energy emitted when electron jumps from fourth orbit to second orbit in hydrogen in 20497 cm−1. The wave number of energy for the same transition in He+ is

article move with velocity v, for time t and v2A pfor time t2 along a straight line. The magnitude ofits average acceterations

Light with an average flux of 10 W cm−2 falls on a non-reflecting surface at normal incidence having surface area 40 cm2. The energy received by the surface during time span of 2 minutes is

A block of mass 10 kg slides with velocity of 10 m/s on a rough horizontal surface. It comes to rest after covering a distance of 50 meters. Find the frictional force.

Consider the circuit shown in the figure. Find out the steady-state current in the 4 Ω resistor. Assume the internal resistance of 8 V battery to be negligible.

Frequency of tuning fork = 256 .It wil\ln ot resonate with a fork of frequency 1) 738 2) 256 3)768 4) 51 4)

A particle moves on a straight line as x=4Sin(2πt + π/3). Find acceleration as a function of x

1 μC charge is uniformly distributed on a spherical shell given by equation x2+y2+z2=25. The intensity of electric field at a point P(1,1,2) m is .

Show that 1C = 3*109Stat c

A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in:

A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512 Hz. If the tube is open at both ends the fundamental frequency that can be excited is ( in Hz ):

11. calculate equivalent weight of NH3 in reaction. N2---NH3 and also for N2

Three charges 2q,-q and -q are located at the vertices of an equilateral triangle . At the central of triangle:A) the field is zero but the potential is non zeroB)the field is non zero but potential is zeroC)both field and potential are zeroD)both field and potential are non-zero

6. A large flat metal surface has a uniform charge density +A. An electron of mass m and charge e leaves the surface at point P with speed u and returns to it at point Q. Disregard gravity what is the maximum value of PQ.

Block P of mass 2 kg slides down the surface and has a speed 20ms at the lowest point, Q where the local radius of curvature is 2 m as shown in the figure. Assuming g=10ms2, the normal force (in N) at Q is (correct to two decimal places).

23.A body is projected at angle 30 degree with the horizontal with momentum p. At its highest point the magnitude of momentum is

By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 20% at a constant temperature?

Two bar magnets A and B of length 10cm are placed in a plane if the magneticstrength of the both magnets are samethen find the ratio of magnetic momentof bar A to B90rI 10 m

When unpolarized beam of light of intensity I° is incident on two polarizer in contact If the angle between the axes of two polarizer is 60^° then the intensity of light inally emerging from the combination i

The units of force ,velocity and energy are 100 dyne,10 cm/s, 500 erg respectively. The units of mass, length,and time are

What is a propellant?

An air bubble of radius 5mm rises through a vat of syrup at a steady speed of 4mm/s. If the syrup has a density of 1.4×103kg/m3, what is its viscosity?

The speed of EM wave is:

A particle executes simple harmonic motion between x=−A and x=+A. The time taken for it to go from the mean position O to A/2 is T1 and to go from A/2 to A is T2. Then

Three identical small balls, each of mass 0.1 g are suspended at one point on the silk thread having a length of 20 cm. What charges should be imparted to the balls for each thread to form an angle of α=30∘ with the vertical ?

If a battery is placed between A and B, with what capacitor you can replace the combination of capacitors?

Why is the value of charge on one electron taken as the value of charge while calculating dipole moment ?can there not be any other value ?

A metallic rod of length l is tied to a string of length 2l and made to rotate angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the emf induced across the ends of the rod is

If two tuning forks A and B are sounded together, the number of beats produced per second is 5. The frequency of A is 250Hz. If the load is attached to tuning fork B, again sounded together, the number of beats produced per second is 3. The frequency of B is

A straight rod of length L extends form x=a to x=L+a. The gravitational force on a point mass m at x=0 if the mass per unit length of the rod is (A+Bx2), is

A uniform magnetic field of magnitude 0.20 T exists in space from east to west. With what speed should a particle of mass 0.010 g and having a charge 1.0×10−5 C be projected from south to north so that it moves with a uniform velocity ?

The difference in the speeds of sound in air at −5∘C, 60 cm pressure of mercury and 30∘C, 75 cm pressure of mercury is (velocity of sound in air at 0∘C is 332 m/s)

The value of C required for sinusoidal oscillation frequency 1 kHz in the circuit of the figure is

What is the centripetal force experienced by a bike of weight 800 N moving at a velocity v m/s and bending with an angle of 60∘ with the ground?