50278 + Interview Questions in Physics Page 188 InterviewSolution

9351.	A parallel plate capacitor is made of two square plates of side ′a′, separated by a distance d(d<<a). The lower triangular portion is filled with a dielectric of dielectric constant K. The capacitance of this capacitor is :
Answer» A parallel plate capacitor is made of two square plates of side $^{'} a^{'}$ , separated by a distance $d (d << a)$ . The lower triangular portion is filled with a dielectric of dielectric constant $K$ . The capacitance of this capacitor is :

Discussion

9352.	A horizontal heavy uniform bar of weight w is supported at its end by two men. If at any instant, one of the man let's go off his end of the rod, then the force experienced by the other changed to a) w b) 3w/2 c) 3w/4 d) w/4
Answer» A horizontal heavy uniform bar of weight w is supported at its end by two men. If at any instant, one of the man let's go off his end of the rod, then the force experienced by the other changed to a) w b) 3w/2 c) 3w/4 d) w/4

Discussion

9353.	Calculate the equivalent capacitance for the following combination between points A and B
Answer» Calculate the equivalent capacitance for the following combination between points A and B

Discussion

9354.	1000 drops of same size are charged to a potential of 1 V each. If they coalesce drop, its potential would be
Answer» 1000 drops of same size are charged to a potential of 1 V each. If they coalesce drop, its potential would be

Discussion

9355.	67. A cubical block of iron 6 cm on each side is floating on mercury in a vessel water is poured on to the vessels so that it just covers the iron block what is the height of water column ?take relative density of Hg= 13.6 and Fe=7.2
Answer» 67. A cubical block of iron 6 cm on each side is floating on mercury in a vessel water is poured on to the vessels so that it just covers the iron block what is the height of water column ?take relative density of Hg= 13.6 and Fe=7.2

Discussion

9356.	If α and β are the roots of the equation ax2+bx+c=0;a,b,c∈I+, such that Δ=∣∣∣∣∣31+α+β1+α2+β21+α+β1+α2+β21+α3+β31+α2+β21+α3+β31+α4+β4∣∣∣∣∣, then Δ is always divisible by
Answer» If $α$ and $β$ are the roots of the equation $a x^{2} + b x + c = 0; a, b, c \in I^{+}$ , such that $Δ = ∣ ∣∣∣ ∣ \begin{matrix} 3 & 1 + α + β & 1 + α^{2} + β^{2} 1 + α + β & 1 + α^{2} + β^{2} & 1 + α^{3} + β^{3} 1 + α^{2} + β^{2} & 1 + α^{3} + β^{3} & 1 + α^{4} + β^{4} \end{matrix} ∣ ∣∣∣ ∣$ , then $Δ$ is always divisible by

Discussion

9357.	The voltage applied across an X-rays tube is nearly
Answer» The voltage applied across an X-rays tube is nearly

Discussion

9358.	In the given figure find(i) position of A with respect to B(ii) position of O with respect to B
Answer» In the given figure find (i) position of $A$ with respect to $B$ (ii) position of $O$ with respect to $B$

Discussion

9359.	Two long straight wires of telephone circuit inside a house are coplanar with and run parallel to a third long straight conductor that carries a current i=i0sinωt. The wires are at a distance of d1 and d2 from the conductor. The conductor induced a noise in the telephone circuit. What is the rms voltage per unit length of this induced emf ? Express your answer in μV. Take d2=2d1,i0=2√2ln2 A,ω=50 rad/s.
Answer» Two long straight wires of telephone circuit inside a house are coplanar with and run parallel to a third long straight conductor that carries a current $i = i_{0} sin ω t$ . The wires are at a distance of $d_{1}$ and $d_{2}$ from the conductor. The conductor induced a noise in the telephone circuit. What is the rms voltage per unit length of this induced emf ? Express your answer in $μ V$ . Take $d_{2} = 2 d_{1}, i_{0} = \frac{2 \sqrt{2}}{ln 2} A, ω = 50 rad/s$ .

Discussion

9360.	A beam of unpolarized light of intensity I0 is passed through a polaroid A and then through another polaroid B. Polaroid B is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of the emergent light is,
Answer» A beam of unpolarized light of intensity $I_{0}$ is passed through a polaroid $A$ and then through another polaroid $B$ . Polaroid $B$ is oriented so that its principal plane makes an angle of $45^{\circ}$ relative to that of $A$ . The intensity of the emergent light is,

Discussion

9361.	Differences between static,kinetic and limiting friction.
Answer» Differences between static,kinetic and limiting friction.

Discussion

9362.	At an instant particle A is at origin and moving with constant velocity (3^i+4^j) m/s and particle B is at (4, 4)m and moving with constant velocity (4^i−3^j) m/s. Then at this instant
Answer» At an instant particle A is at origin and moving with constant velocity $(3^i + 4^j)$ m/s and particle B is at (4, 4)m and moving with constant velocity $(4^i - 3^j)$ m/s. Then at this instant

Discussion

9363.	The moment of inertia of a thin uniform rod of mass M and length L about an axis perpendicular to its length ML^2/10. The distance of the axis from the center of the rod
Answer» The moment of inertia of a thin uniform rod of mass M and length L about an axis perpendicular to its length ML^2/10. The distance of the axis from the center of the rod

Discussion

9364.	For two resistors , R1 AND R2 , connected in parallel, find the relative error in their equivalent resistance, if r1 = 5+-2 and r2= 100+-3
Answer» For two resistors , R1 AND R2 , connected in parallel, find the relative error in their equivalent resistance, if r1 = 5+-2 and r2= 100+-3

Discussion

9365.	A system consists of two small spheres of mass 1 kg and 2 kg interconnected by a weightless spring. At t=0, the spheres are set in motion with initial velocities as shown in the figure. The position vector of centre of mass at t=0 is (20 ^j) m. Initially, spring is in its natural length. The system moves in earth's gravitational field. The momentum of the system at t=2 s in kg-m/s is[g=10 m/s2, com is initial centre of mass]
Answer» A system consists of two small spheres of mass $1 kg$ and $2 kg$ interconnected by a weightless spring. At $t = 0$ , the spheres are set in motion with initial velocities as shown in the figure. The position vector of centre of mass at $t = 0$ is $(20^j) m$ . Initially, spring is in its natural length. The system moves in earth's gravitational field. The momentum of the system at $t = 2 s$ in $kg-m/s$ is $[g = 10 {m/s}^{2}, com is initial centre of mass]$

Discussion

9366.	A rod has actual length at 20∘C. Find the highest possible temperature at which the length should be measured, so that the error in measurement do not exceed 0.01 %. The thermal coefficient of linear expansion is 2×10−5/∘C
Answer» A rod has actual length at $20^{\circ} C$ . Find the highest possible temperature at which the length should be measured, so that the error in measurement do not exceed $0.01 %$ . The thermal coefficient of linear expansion is $2 \times 10^{- 5} /^{\circ} C$

Discussion

9367.	Solve: 2log2(log2x)+log½(log2 2√2x)=1
Answer» Solve: 2log2(log2x)+log½(log2 2√2x)=1

Discussion

9368.	The energy absorbed by each molecule (A2) of a substance is 4.4x 10-19J and bond energy per molecule is 4.0×10-19 J. The kinetic energy of the molecule per atom will be
Answer» The energy absorbed by each molecule (A2) of a substance is 4.4x 10-19J and bond energy per molecule is 4.0×10-19 J. The kinetic energy of the molecule per atom will be

Discussion

9369.	An electric field E-(20i + 30j) N/C exists in space.If electric potential at origin is taken to be 50 Vthen electric potential at (2 m, 2 m) is(1) 10 V(3) -50 V(2) 10 V(4) 100 vyot 6o
Answer» An electric field E-(20i + 30j) N/C exists in space.If electric potential at origin is taken to be 50 Vthen electric potential at (2 m, 2 m) is(1) 10 V(3) -50 V(2) 10 V(4) 100 vyot 6o

Discussion

9370.	pick correct statements:(multiple choice ) 1. average speed of a particle in a given time is never less then the magnitude of the average velocity 2.it is possible to have a situation in which magnitude of acceleration not equal to 0 but magnitude of †an gential acceleration is equal 3.the average velocity of a particle is 0 in a time interval. it is po.ssible that the ins†an†an eous velocity is never zero in the interval. 4. the average velocity of a particle moving on a straight line is 0 in a time interval.it is possible that ins†an†an eous velocity is never 0 in the interval
Answer» pick correct statements:(multiple choice ) 1. average speed of a particle in a given time is never less then the magnitude of the average velocity 2.it is possible to have a situation in which magnitude of acceleration not equal to 0 but magnitude of †an gential acceleration is equal 3.the average velocity of a particle is 0 in a time interval. it is po.ssible that the ins†an†an eous velocity is never zero in the interval. 4. the average velocity of a particle moving on a straight line is 0 in a time interval.it is possible that ins†an†an eous velocity is never 0 in the interval

Discussion

9371.	In a closed organ pipe of length 105 centimetres standing waves are setup corresponding to 3rd overtone. What distance from the closed end a pressure node is formed?
Answer» In a closed organ pipe of length 105 centimetres standing waves are setup corresponding to 3rd overtone. What distance from the closed end a pressure node is formed?

Discussion

9372.	Predictthe direction of induced current in the situations described by thefollowing Figs. 6.18(a) to (f ).(a)(b)(c)(d)(e)(f)
Answer» Predict the direction of induced current in the situations described by the following Figs. 6.18(a) to (f ). (a) (b) (c) (d) (e) (f)

9372.

Predictthe direction of induced current in the situations described by thefollowing Figs. 6.18(a) to (f ).(a)(b)(c)(d)(e)(f)

Answer»

Predict
the direction of induced current in the situations described by the
following Figs. 6.18(a) to (f ).

(a)

(b)

(c)

(d)

(e)

(f)

Discussion

9373.	A boat in the river accelerates in a straight line starting from rest at a constant rate of 3 m/s2 for 10 s. How far does the boat travel during this time ?
Answer» A boat in the river accelerates in a straight line starting from rest at a constant rate of $3 {m/s}^{2}$ for $10 s$ . How far does the boat travel during this time ?

Discussion

9374.	A constant force of 2.50 N accelerates a stationary particle of mass 15 g through a displacement of 2.50 m. Find the work done and the average power delivered.
Answer» A constant force of 2.50 N accelerates a stationary particle of mass 15 g through a displacement of 2.50 m. Find the work done and the average power delivered.

Discussion

9375.	A particle of mass m has half the kinetic energy of another particle of mass m2. The ratio of the speeds of the lighter and heavier particles is
Answer» A particle of mass $m$ has half the kinetic energy of another particle of mass $\frac{m}{2}$ . The ratio of the speeds of the lighter and heavier particles is

Discussion

9376.	An arrangement of pulley, string and blocks is shown in figure. Given m1=4 kg,m2=2 kg and m3=4 kg. All surfaces are frictionless, string and pulleys are massless. Find the acceleration of block m1. Assume g=10 m/s2.
Answer» An arrangement of pulley, string and blocks is shown in figure. Given $m_{1} = 4 kg, m_{2} = 2 kg$ and $m_{3} = 4 kg$ . All surfaces are frictionless, string and pulleys are massless. Find the acceleration of block $m_{1}$ . Assume $g = 10 {m/s}^{2}$ .

Discussion

9377.	If the given figure shows equipotential surfaces then the magnitude of electric field is
Answer» If the given figure shows equipotential surfaces then the magnitude of electric field is

Discussion

9378.	Find the amplitude of the electric field in a parallel beam of light of intensity 2.0 Wm−2.
Answer» Find the amplitude of the electric field in a parallel beam of light of intensity $2.0 {Wm}^{- 2}$ .

Discussion

9379.	If the series limit of wavelength of the lyman series for the hydrogen atoms is 912 angstrom then the series limit of wavelength for the balmer of the hydrogen atoms
Answer» If the series limit of wavelength of the lyman series for the hydrogen atoms is 912 angstrom then the series limit of wavelength for the balmer of the hydrogen atoms

Discussion

9380.	A particle is displaced from point A (1,2,3) to B (1,3,4) under action of two constant forces →F1=^i+2^j+^k and →F2=^i+^j. Find the total work done on the particle to move it from point A to B.
Answer» A particle is displaced from point $A (1, 2, 3)$ to $B (1, 3, 4)$ under action of two constant forces ${\to F}_{1} =$ $^i + 2^j +^k$ and ${\to F}_{2} =$ $^i +^j$ . Find the total work done on the particle to move it from point $A$ to $B$ .

Discussion

9381.	The radius of gyration of a spherical shell of mass M and radius R about its tangential axis will be
Answer» The radius of gyration of a spherical shell of mass $M$ and radius $R$ about its tangential axis will be

Discussion

9382.	Suppose that F(x) is an anti - derivative of f(x)=sinxx, where x>0, then 3∫1sin2xxdx can be expressed as
Answer» Suppose that $F (x)$ is an anti - derivative of $f (x) = \frac{sin x}{x}$ , where $x > 0,$ then $3 \int 1 \frac{sin 2 x}{x} d x$ can be expressed as

Discussion

9383.	A father racing with his son,has 1/3 of KE of his son,who has 1/3 the mass of the father.The father speeds up by 2 m/s and then has the same KE as that of the son.The initial speeds of the father and the son are
Answer» A father racing with his son,has 1/3 of KE of his son,who has 1/3 the mass of the father.The father speeds up by 2 m/s and then has the same KE as that of the son.The initial speeds of the father and the son are

Discussion

9384.	Across a metallic conductor of non uniform cross section a cons†an t potential difference is applied. The quantity which remains cons†an t along the conductor
Answer» Across a metallic conductor of non uniform cross section a cons†an t potential difference is applied. The quantity which remains cons†an t along the conductor

Discussion

9385.	In the setup shown in the figure (D>>d) and d=4λ. Find the total number of maxima on the screen.
Answer» In the setup shown in the figure $(D >> d)$ and $d = 4 λ$ . Find the total number of maxima on the screen.

Discussion

9386.	A horizontal force F pulls a ring of mass m1 such that θ remains constant with time. The ring is constrained to move along a smooth rigid horizontal wire. A bob of mass m2 hangs from m1 by an inextensible light string. Then match the entries of Column I with that of Column II Column IColumn IIi.Fa.(m1+m2)gii.Force acting on m2 isb.m2g sec θiii.Tension in the string isc.m2Fm1+m2iv.Force acting on m1 by the wire isd.(m1+m2)g tan θ
Answer» A horizontal force $F$ pulls a ring of mass $m_{1}$ such that $θ$ remains constant with time. The ring is constrained to move along a smooth rigid horizontal wire. A bob of mass $m_{2}$ hangs from $m_{1}$ by an inextensible light string. Then match the entries of Column I with that of Column II $\begin{matrix} Column I & Column II i. & F & a. & (m_{1} + m_{2}) g ii. & Force acting on m_{2} is & b. & m_{2} g sec θ iii. & Tension in the string is & c. & m_{2} \frac{F}{m_{1} + m_{2}} iv. & Force acting on m_{1} by the wire is & d. & (m_{1} + m_{2}) g tan θ \end{matrix}$

Discussion

9387.	A long cylinder of radius 2 cm carries a charge of 5 μ C/m kept in the medium of dielectric constant 10, find the electric field intensity at a point situated at a distance 1 m from the axis of cylinder
Answer» A long cylinder of radius 2 cm carries a charge of 5 μ C/m kept in the medium of dielectric constant 10, find the electric field intensity at a point situated at a distance 1 m from the axis of cylinder

Discussion

9388.	A block of mass 1 kg is attached to a spring of spring constant 100 N/m. The block is at the centre of curvature of the concave mirror in equilibrium state. It is displaced by 5 mm towards the pole and released. The maximum speed of oscillation of the image of the block is
Answer» A block of mass $1 kg$ is attached to a spring of spring constant $100 N/m$ . The block is at the centre of curvature of the concave mirror in equilibrium state. It is displaced by $5 mm$ towards the pole and released. The maximum speed of oscillation of the image of the block is

Discussion

9389.	For a concave mirror, if real image is formed the graph between is of the form
Answer» For a concave mirror, if real image is formed the graph between is of the form

Discussion

9390.	why and how is there space between 2 objects even when they are in contact ?How does this force work?
Answer» why and how is there space between 2 objects even when they are in contact ?How does this force work?

Discussion

9391.	Calculate the resistance of the given coloured resistance.
Answer» Calculate the resistance of the given coloured resistance.

Discussion

9392.	The wavelength of first lines of Balmer series and Lyman series are related as λBλL=27n; then n is:___
Answer» The wavelength of first lines of Balmer series and Lyman series are related as $\frac{λ_{B}}{λ_{L}} = \frac{27}{n}$ ; then n is:___

Discussion

9393.	A person is standing in an elevator. In which situation he finds his weight less than actual when(1) the elevator moves upward with constant acceleration(2) the elevator moves downward with constant acceleration(3) the elevator moves upward with uniform velocity(4) the elevator moves downward with uniform velocity
Answer» A person is standing in an elevator. In which situation he finds his weight less than actual when (1) the elevator moves upward with constant acceleration (2) the elevator moves downward with constant acceleration (3) the elevator moves upward with uniform velocity (4) the elevator moves downward with uniform velocity

Discussion

9394.	From a solid sphere of mass M and radius R, a cube of maximum possible volume is cut. Then, moment of inertia of the cube about an axis passing through its centre and perpendicular to one of its faces is:
Answer» From a solid sphere of mass $M$ and radius $R$ , a cube of maximum possible volume is cut. Then, moment of inertia of the cube about an axis passing through its centre and perpendicular to one of its faces is:

Discussion

9395.	A linear thin rod of length f3 is placed along the optical axis of a concave mirror of focal length f such that its image which is real and elongated just touches the rod. Find the magnification.
Answer» A linear thin rod of length $\frac{f}{3}$ is placed along the optical axis of a concave mirror of focal length $f$ such that its image which is real and elongated just touches the rod. Find the magnification.

Discussion

9396.	Why do extra charges given to a conductor reside on the outer surface?
Answer» Why do extra charges given to a conductor reside on the outer surface?

Discussion

9397.	A box executes simple harmonic motion under the action of a force F1 with a time period 45 s. If the force is changed to F2, it executes S.H.M with time period 35 s. If both the forces F1 and F2 act simultaneously in the same direction on the body, its time period in seconds will be
Answer» A box executes simple harmonic motion under the action of a force $F_{1}$ with a time period $\frac{4}{5} s$ . If the force is changed to $F_{2}$ , it executes S.H.M with time period $\frac{3}{5} s$ . If both the forces $F_{1}$ and $F_{2}$ act simultaneously in the same direction on the body, its time period in seconds will be

Discussion

9398.	46. two point masses having masses m and 2m are placed at a distance d. The point on the line joing the two masses where gravitational feild intensity is zero will b at a distance, 1. 2d/root3 + 1 from point mass 2m 2. 2d/root3 - 1 from point mass 2m 3. d/1 + root2 from point mass m 4. d/1 - root2 from point mass m
Answer» 46. two point masses having masses m and 2m are placed at a distance d. The point on the line joing the two masses where gravitational feild intensity is zero will b at a distance, 1. 2d/root3 + 1 from point mass 2m 2. 2d/root3 - 1 from point mass 2m 3. d/1 + root2 from point mass m 4. d/1 - root2 from point mass m

Discussion

9399.	The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror, so that its real image is three times the size of the object
Answer» The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror, so that its real image is three times the size of the object

Discussion

9400.	16.A bar magnet is oscillating in the earth's magnetic field with a period T.what happens to its period and motion if its mass is quadrupled
Answer» 16.A bar magnet is oscillating in the earth's magnetic field with a period T.what happens to its period and motion if its mass is quadrupled

Discussion

Explore topic-wise InterviewSolutions in .

A parallel plate capacitor is made of two square plates of side ′a′, separated by a distance d(d&lt;&lt;a). The lower triangular portion is filled with a dielectric of dielectric constant K. The capacitance of this capacitor is :

A horizontal heavy uniform bar of weight w is supported at its end by two men. If at any instant, one of the man let's go off his end of the rod, then the force experienced by the other changed to a) w b) 3w/2 c) 3w/4 d) w/4

Calculate the equivalent capacitance for the following combination between points A and B

1000 drops of same size are charged to a potential of 1 V each. If they coalesce drop, its potential would be

67. A cubical block of iron 6 cm on each side is floating on mercury in a vessel water is poured on to the vessels so that it just covers the iron block what is the height of water column ?take relative density of Hg= 13.6 and Fe=7.2

If α and β are the roots of the equation ax2+bx+c=0;a,b,c∈I+, such that Δ=∣∣∣∣∣31+α+β1+α2+β21+α+β1+α2+β21+α3+β31+α2+β21+α3+β31+α4+β4∣∣∣∣∣, then Δ is always divisible by

The voltage applied across an X-rays tube is nearly

In the given figure find(i) position of A with respect to B(ii) position of O with respect to B

A beam of unpolarized light of intensity I0 is passed through a polaroid A and then through another polaroid B. Polaroid B is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of the emergent light is,

Differences between static,kinetic and limiting friction.

At an instant particle A is at origin and moving with constant velocity (3^i+4^j) m/s and particle B is at (4, 4)m and moving with constant velocity (4^i−3^j) m/s. Then at this instant

The moment of inertia of a thin uniform rod of mass M and length L about an axis perpendicular to its length ML^2/10. The distance of the axis from the center of the rod

For two resistors , R1 AND R2 , connected in parallel, find the relative error in their equivalent resistance, if r1 = 5+-2 and r2= 100+-3

A rod has actual length at 20∘C. Find the highest possible temperature at which the length should be measured, so that the error in measurement do not exceed 0.01 %. The thermal coefficient of linear expansion is 2×10−5/∘C

Solve: 2log2(log2x)+log½(log2 2√2x)=1

The energy absorbed by each molecule (A2) of a substance is 4.4x 10-19J and bond energy per molecule is 4.0×10-19 J. The kinetic energy of the molecule per atom will be

An electric field E-(20i + 30j) N/C exists in space.If electric potential at origin is taken to be 50 Vthen electric potential at (2 m, 2 m) is(1) 10 V(3) -50 V(2) 10 V(4) 100 vyot 6o

In a closed organ pipe of length 105 centimetres standing waves are setup corresponding to 3rd overtone. What distance from the closed end a pressure node is formed?

Predictthe direction of induced current in the situations described by thefollowing Figs. 6.18(a) to (f ).(a)(b)(c)(d)(e)(f)

A boat in the river accelerates in a straight line starting from rest at a constant rate of 3 m/s2 for 10 s. How far does the boat travel during this time ?

A constant force of 2.50 N accelerates a stationary particle of mass 15 g through a displacement of 2.50 m. Find the work done and the average power delivered.

A particle of mass m has half the kinetic energy of another particle of mass m2. The ratio of the speeds of the lighter and heavier particles is

An arrangement of pulley, string and blocks is shown in figure. Given m1=4 kg,m2=2 kg and m3=4 kg. All surfaces are frictionless, string and pulleys are massless. Find the acceleration of block m1. Assume g=10 m/s2.

If the given figure shows equipotential surfaces then the magnitude of electric field is

Find the amplitude of the electric field in a parallel beam of light of intensity 2.0 Wm−2.

If the series limit of wavelength of the lyman series for the hydrogen atoms is 912 angstrom then the series limit of wavelength for the balmer of the hydrogen atoms

A particle is displaced from point A (1,2,3) to B (1,3,4) under action of two constant forces →F1=^i+2^j+^k and →F2=^i+^j. Find the total work done on the particle to move it from point A to B.

The radius of gyration of a spherical shell of mass M and radius R about its tangential axis will be

Suppose that F(x) is an anti - derivative of f(x)=sinxx, where x&gt;0, then 3∫1sin2xxdx can be expressed as

A father racing with his son,has 1/3 of KE of his son,who has 1/3 the mass of the father.The father speeds up by 2 m/s and then has the same KE as that of the son.The initial speeds of the father and the son are

Across a metallic conductor of non uniform cross section a cons†an t potential difference is applied. The quantity which remains cons†an t along the conductor

In the setup shown in the figure (D&gt;&gt;d) and d=4λ. Find the total number of maxima on the screen.

A long cylinder of radius 2 cm carries a charge of 5 μ C/m kept in the medium of dielectric constant 10, find the electric field intensity at a point situated at a distance 1 m from the axis of cylinder

A block of mass 1 kg is attached to a spring of spring constant 100 N/m. The block is at the centre of curvature of the concave mirror in equilibrium state. It is displaced by 5 mm towards the pole and released. The maximum speed of oscillation of the image of the block is

For a concave mirror, if real image is formed the graph between is of the form

why and how is there space between 2 objects even when they are in contact ?How does this force work?

Calculate the resistance of the given coloured resistance.

The wavelength of first lines of Balmer series and Lyman series are related as λBλL=27n; then n is:___

From a solid sphere of mass M and radius R, a cube of maximum possible volume is cut. Then, moment of inertia of the cube about an axis passing through its centre and perpendicular to one of its faces is:

A linear thin rod of length f3 is placed along the optical axis of a concave mirror of focal length f such that its image which is real and elongated just touches the rod. Find the magnification.

Why do extra charges given to a conductor reside on the outer surface?

A box executes simple harmonic motion under the action of a force F1 with a time period 45 s. If the force is changed to F2, it executes S.H.M with time period 35 s. If both the forces F1 and F2 act simultaneously in the same direction on the body, its time period in seconds will be

The focal length of a concave mirror is 30cm.Find position of an object in front of the mirror, so that its real image is three times the size of the object

16.A bar magnet is oscillating in the earth's magnetic field with a period T.what happens to its period and motion if its mass is quadrupled

A parallel plate capacitor is made of two square plates of side ′a′, separated by a distance d(d<<a). The lower triangular portion is filled with a dielectric of dielectric constant K. The capacitance of this capacitor is :

Suppose that F(x) is an anti - derivative of f(x)=sinxx, where x>0, then 3∫1sin2xxdx can be expressed as

In the setup shown in the figure (D>>d) and d=4λ. Find the total number of maxima on the screen.