50278 + Interview Questions in Physics Page 326 InterviewSolution

16251.	what is the meaning of beta decay in weak nuclear forces
Answer» what is the meaning of beta decay in weak nuclear forces

Discussion

16252.	A circular disc of radius 𝑅 carries surface charge density σ(r)=σo(1−rR),where σo is a constant and r is the distance from the center of the disc. Electric flux through a large spherical surface that encloses the charged disc completely is ϕ0 . Electric flux through another spherical surface of radiusR4 and concentric with the disc is ϕ.Then the ratio ϕ0ϕ is
Answer» A circular disc of radius 𝑅 carries surface charge density $σ (r) = σ_{o} (1 - \frac{r}{R})$ ,where $σ_{o}$ is a constant and $r$ is the distance from the center of the disc. Electric flux through a large spherical surface that encloses the charged disc completely is $ϕ_{0}$ . Electric flux through another spherical surface of radius $\frac{R}{4}$ and concentric with the disc is $ϕ$ .Then the ratio $\frac{ϕ_{0}}{ϕ}$ is

Discussion

16253.	A hollow sphere of radius r rolls without slipping in a hemisphere of radius 4r. Calculate the frequency of small oscillations, about point P as shown in figure.
Answer» A hollow sphere of radius r rolls without slipping in a hemisphere of radius 4r. Calculate the frequency of small oscillations, about point P as shown in figure.

16253.

A hollow sphere of radius r rolls without slipping in a hemisphere of radius 4r. Calculate the frequency of small oscillations, about point P as shown in figure.

Answer»

A hollow sphere of radius r rolls without slipping in a hemisphere of radius 4r. Calculate the frequency of small oscillations, about point P as shown in figure.

Discussion

16254.	A short bar magnet placed with its axis at 30∘ with a uniform external magnetic field of 0.16 T , experiences a torque of 0.032 Nm. If the bar magnet is free to rotate, its potential energy when it is in stable and unstable equilibrium are-
Answer» A short bar magnet placed with its axis at $30^{\circ}$ with a uniform external magnetic field of $0.16 T$ , experiences a torque of $0.032 Nm .$ If the bar magnet is free to rotate, its potential energy when it is in stable and unstable equilibrium are-

Discussion

16255.	A dipole with dipole moment 3.60 nC−m is oriented at 60∘ to an electric field of magnitude 4×109 N/C, how much work is required to rotate the dipole until it is antiparallel to field.
Answer» A dipole with dipole moment $3.60 n C - m$ is oriented at $60^{\circ}$ to an electric field of magnitude $4 \times 10^{9} N / C$ , how much work is required to rotate the dipole until it is antiparallel to field.

Discussion

16256.	A large spherical mass M is fixed at one position and two identical point masses m are kept on a line passing through the centre of M as shown in the figure.The point masses are connected by a rigid massless rod of length l and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction.When the point mass nearer to M is at distance r=3l from M, the tension in the rod is zero for m=k(M288). The value of k is
Answer» A large spherical mass $M$ is fixed at one position and two identical point masses $m$ are kept on a line passing through the centre of $M$ as shown in the figure.The point masses are connected by a rigid massless rod of length $l$ and this assembly is free to move along the line connecting them. All three masses interact only through their mutual gravitational interaction.When the point mass nearer to $M$ is at distance $r = 3 l$ from $M$ , the tension in the rod is zero for $m = k (\frac{M}{288})$ . The value of $k$ is

Discussion

16257.	A riffle of mass 25 kg fires at the rate of 6 bullets per second. If the mass of each bullet is 30 g and the velocity of the bullet when it leaves the gun is 1080 km/h, find the magnitude of average force required to hold the gun while firing (neglect recoil speed of riffle).
Answer» A riffle of mass $25 kg$ fires at the rate of 6 bullets per second. If the mass of each bullet is $30 g$ and the velocity of the bullet when it leaves the gun is $1080 km/h$ , find the magnitude of average force required to hold the gun while firing (neglect recoil speed of riffle).

Discussion

16258.	What are the merits of Dalton’s atomic theory?
Answer» What are the merits of Dalton’s atomic theory?

Discussion

16259.	What is momentum ?Why do we study momentum
Answer» What is momentum ?Why do we study momentum

Discussion

16260.	the surface tension of water is 72 dyne/ cm.convert it in si uni
Answer» the surface tension of water is 72 dyne/ cm.convert it in si uni

Discussion

16261.	The percentage error in measuring resistance with meter-bridge can be minimized by adjusting the balance point close to
Answer» The percentage error in measuring resistance with meter-bridge can be minimized by adjusting the balance point close to

Discussion

16262.	A uniform rod of length l is pivoted at one of its ends on a vertical shaft of negligible radius. When the shaft rotates at angular speed ω the rod makes an angle θ with it (see figure). To find θ, equate the rate of change of angular momentum (direction going into the paper) ml212ω2sinθcosθ about the centre of mass (CM) to the torque provided by the horizontal and vertical forces FH and FV about the CM. The value of θ is then such that:
Answer» A uniform rod of length $l$ is pivoted at one of its ends on a vertical shaft of negligible radius. When the shaft rotates at angular speed $ω$ the rod makes an angle $θ$ with it (see figure). To find $θ$ , equate the rate of change of angular momentum (direction going into the paper) $\frac{m l^{2}}{12} ω^{2} sin θ cos θ$ about the centre of mass $(C M)$ to the torque provided by the horizontal and vertical forces $F_{H} and F_{V}$ about the $C M$ . The value of $θ$ is then such that:

Discussion

16263.	Consider two vectors →a=^i+^j,→b=2^i−^j and a third vector coplanar with →a and →b and also perpendicular to →a with unit magnitude. Then the third vector is
Answer» Consider two vectors $\to a =^i +^j, \to b = 2^i -^j$ and a third vector coplanar with $\to a$ and $\to b$ and also perpendicular to $\to a$ with unit magnitude. Then the third vector is

Discussion

16264.	A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is
Answer» A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is

Discussion

16265.

A charged particle (electron or proton) is introduced at the origin (x=0,y=0,x=0) with a given initial velocity →v. A uniform electric field →E and a uniform magnetic field →B exist everywhere. The velocity →v, electric field →E and magnetic field →B are given in column 1,2 and 3, respectively. The quantities E0, B0 are positive in magnitude.Column 1Column 2Column 3(I) Electron with →v=2E0B0^x(i) →E=E0^z(P) →B=−B0^x(II) Electron with →v=E0B0^y(ii) →E=−E0^y(Q) →B=−B0^x(III) Electron with →v=0(iii) →E=−E0^x(R) →B=B0^y(IV) Electron with →v=2E0B0^x(iv) →E=E0^x(S) →B=B0^z In which case will the particle move in a straight line with constant velocity?

Answer»

A charged particle (electron or proton) is introduced at the origin $(x = 0, y = 0, x = 0)$ with a given initial velocity $\to v$ . A uniform electric field $\to E$ and a uniform magnetic field $\to B$ exist everywhere. The velocity $\to v$ , electric field $\to E$ and magnetic field $\to B$ are given in column $1, 2$ and $3,$ respectively. The quantities $E_{0}, B_{0}$ are positive in magnitude.

Column 1	Column 2	Column 3
$(I)$ Electron with $\to v = 2 \frac{E_{0}}{B_{0}}^x$	$(i)$ $\to E = E_{0}^z$	$(P)$ $\to B = - B_{0}^x$
$(I I)$ Electron with $\to v = \frac{E_{0}}{B_{0}}^y$	$(i i)$ $\to E = - E_{0}^y$	$(Q)$ $\to B = - B_{0}^x$
$(I I I)$ Electron with $\to v = 0$	$(i i i)$ $\to E = - E_{0}^x$	$(R)$ $\to B = B_{0}^y$
$(I V)$ Electron with $\to v = 2 \frac{E_{0}}{B_{0}}^x$	$(i v)$ $\to E = E_{0}^x$	$(S)$ $\to B = B_{0}^z$

In which case will the particle move in a straight line with constant velocity?

Discussion

16266.	A bird is flying up at angle sin−1(3/5) with the horizontal. A fish in a pond looks at that bird. When it is vertically above the fish, the angle (in degrees) at which the bird appears to fly (to the fish) is [nwater=4/3]
Answer» A bird is flying up at angle $s i n^{- 1} (3 / 5)$ with the horizontal. A fish in a pond looks at that bird. When it is vertically above the fish, the angle (in degrees) at which the bird appears to fly (to the fish) is $[n_{w a t e r} = 4 / 3]$

Discussion

16267.	Steel wire of length ′L′ at 40∘C is suspended from the ceiling and then a mass ′m′ is hung from its free end. The wire is cooled down from 40∘C to 30∘C to regain its original length ′L′. The coefficient of linear thermal expansion of the steel is 10−5/∘C, Young's modulus of steel is 1011 N/m2 and radius of the wire is 1 mm. Assume that L>> diameter of the wire. Then the value of ′m′ in kg is nearly.
Answer» Steel wire of length $^{'} L^{'} a t 40^{\circ} C$ is suspended from the ceiling and then a mass $^{'} m^{'}$ is hung from its free end. The wire is cooled down from $40^{\circ} C t o 30^{\circ} C$ to regain its original length $^{'} L^{'}$ . The coefficient of linear thermal expansion of the steel is $10^{- 5 / \circ} C$ , Young's modulus of steel is $10^{11} N / m^{2}$ and radius of the wire is $1 m m$ . Assume that $L >>$ diameter of the wire. Then the value of $^{'} m^{'}$ in kg is nearly.

Discussion

16268.	Consider a PCM system wth n=8 bits/sample. It is intended to increase the signal to quantization noise ratio of the existing system by 6 dB, by increasing the value of n. Then the corresponding increment in the required channel bandwidth will be _______% 12.5
Answer» Consider a PCM system wth $n = 8$ bits/sample. It is intended to increase the signal to quantization noise ratio of the existing system by 6 dB, by increasing the value of n. Then the corresponding increment in the required channel bandwidth will be _______ $%$ 12.5

Discussion

16269.	There is two metal oxide. The higher metal oxide consists of 80% metal. 0.72g of lower metal oxide give 0.8g of higher metal oxide. Calculate the ratio of the weights of the oxygen in both the metal oxides with a fixed weight of metal.
Answer» There is two metal oxide. The higher metal oxide consists of 80% metal. 0.72g of lower metal oxide give 0.8g of higher metal oxide. Calculate the ratio of the weights of the oxygen in both the metal oxides with a fixed weight of metal.

Discussion

16270.	In the figure shown below, the block on the frictionless surface is having acceleration a towards left and the other block is having acceleration a′. Find the relation between the accelerations of the two blocks.
Answer» In the figure shown below, the block on the frictionless surface is having acceleration $a$ towards left and the other block is having acceleration $a^{'}$ . Find the relation between the accelerations of the two blocks.

Discussion

16271.	When frequency of RL circuit is doubled its impedance will beOptions:DoubledHalvedDecrease Increase
Answer» When frequency of RL circuit is doubled its impedance will be Options: Doubled Halved Decrease Increase

Discussion

16272.	Electron with de-Broglie wavelength l fall on the target in an x-ray tube. The cut off wavelength of the emitted x-rays is:
Answer» Electron with de-Broglie wavelength l fall on the target in an x-ray tube. The cut off wavelength of the emitted x-rays is:

Discussion

16273.	A particle of unit mass undergoes one-dimensional motion such that its velacity varies according to {V(x)=Bx^{-2 , where β and n are constants and x is the position of the particle. The acceleration of the particle as a function of x, is given by
Answer» A particle of unit mass undergoes one-dimensional motion such that its velacity varies according to {V(x)=Bx^{-2 , where β and n are constants and x is the position of the particle. The acceleration of the particle as a function of x, is given by

Discussion

16274.	why does the total time of flight only depend on vertical motion in any projectile motion even in the inclined plane motion also?
Answer» why does the total time of flight only depend on vertical motion in any projectile motion even in the inclined plane motion also?

Discussion

16275.	A coil of 10^{-2 }H inductance carries a current I=2sin(100t)A when current is half of its maximum value then at that instant the induced emf in the coil Will be 1)1v 2)2v 3)3 4)2v
Answer» A coil of 10^{-2 }H inductance carries a current I=2sin(100t)A when current is half of its maximum value then at that instant the induced emf in the coil Will be 1)1v 2)2v 3)3 4)2v

Discussion

16276.	the momentum of a photon having energy equal to the rest energy of an electron i
Answer» the momentum of a photon having energy equal to the rest energy of an electron i

Discussion

16277.	If →A is parallel to→B then choose incorrect option (λ is positve constant)
Answer» If $\to A$ is parallel to $\to B$ then choose incorrect option $(λ is positve constant)$

Discussion

16278.	3. When a particle is projected at some angle to the horizontal, it has a range R and time of flight t1. If the same particle is projected with the same speed at some other angle to have the same range, its time of flight is t2, then 1) t1 + t2 = 2R/g 2) t1 - t2 = R/g 3) t1t2 =2R/g 4) t1t2 = R/g
Answer» 3. When a particle is projected at some angle to the horizontal, it has a range R and time of flight t1. If the same particle is projected with the same speed at some other angle to have the same range, its time of flight is t2, then 1) t1 + t2 = 2R/g 2) t1 - t2 = R/g 3) t1t2 =2R/g 4) t1t2 = R/g

Discussion

16279.	A short dipole is placed at origin of coordinate system in x-y plane as shown in figure. Find the electric field at point P(0, y). (y>> length of dipole)
Answer» A short dipole is placed at origin of coordinate system in $x-y$ plane as shown in figure. Find the electric field at point $P (0, y)$ . $(y >>$ length of dipole $)$

Discussion

16280.	Electric field is directed towards
Answer» Electric field is directed towards

Discussion

16281.	Why is an atom indivisible?
Answer» Why is an atom indivisible?

Discussion

16282.	A ball is projected with a velocity u at an elevation from a point distance d from a smooth vertical wall in a plane perpendicular to it. After rebounding from the wall, it returns to the point of projection, find the maximum distance d for which the ball can return to the point of projection.
Answer» A ball is projected with a velocity $u$ at an elevation from a point distance d from a smooth vertical wall in a plane perpendicular to it. After rebounding from the wall, it returns to the point of projection, find the maximum distance $d$ for which the ball can return to the point of projection.

16282.

A ball is projected with a velocity u at an elevation from a point distance d from a smooth vertical wall in a plane perpendicular to it. After rebounding from the wall, it returns to the point of projection, find the maximum distance d for which the ball can return to the point of projection.

Answer»

A ball is projected with a velocity $u$ at an elevation from a point distance d from a smooth vertical wall in a plane perpendicular to it. After rebounding from the wall, it returns to the point of projection, find the maximum distance $d$ for which the ball can return to the point of projection.

Discussion

16283.	32.If a person jumps 1 m on the earth, then he will jump 6 m at the surface of the moon. Therefore,the ratio of moon's acceleration due to gravity with Respect to earth's acceleration due to gravity would be
Answer» 32.If a person jumps 1 m on the earth, then he will jump 6 m at the surface of the moon. Therefore,the ratio of moon's acceleration due to gravity with Respect to earth's acceleration due to gravity would be

Discussion

16284.	Consider the diagram below. If support B sinks by 5 mm, then slope of beam at support B will be×10−4 radian. 7.5
Answer» Consider the diagram below. If support B sinks by 5 mm, then slope of beam at support B will be $\times 10^{- 4}$ radian. 7.5

Discussion

16285.	An ant slides from point (0, 0) to (3, 4, 6) under the wind force →F=(2x^i+4^j+6z^k). Find the work done by the force of wind in Joules. __
Answer» An ant slides from point (0, 0) to (3, 4, 6) under the wind force $\to F = (2 x^i + 4^j + 6 z^k)$ . Find the work done by the force of wind in Joules. __

16285.

An ant slides from point (0, 0) to (3, 4, 6) under the wind force →F=(2x^i+4^j+6z^k). Find the work done by the force of wind in Joules. __

Answer»

An ant slides from point (0, 0) to (3, 4, 6) under the wind force $\to F = (2 x^i + 4^j + 6 z^k)$ . Find the work

done by the force of wind in Joules.

__

Discussion

16286.

Following results areobserved when sodium metal is irradiated with different wavelengths.Calculate (a) threshold wavelength and, (b) Planck’s constant. λ (nm) 500 450 400 v × 10–5 (cm s–1) 2.55 4.35 5.35

Answer»

Following results are
observed when sodium metal is irradiated with different wavelengths.
Calculate (a) threshold wavelength and, (b) Planck’s constant.

λ (nm)	500	450	400
v × 10^–5 (cm s^–1)	2.55	4.35	5.35

Discussion

16287.	Find derivative of f(x)=esinx+lnx+8x
Answer» Find derivative of $f (x) = e^{sin x} + ln x + 8^{x}$

Discussion

16288.	Two concentric thin conducting spherical shells having radius R and 2R are shown in figure. A charge +Q is given to shell A and −4Q is given to shell B. Now shell A and B are connected by a thin conducting wire, then the final charge on the sphere B will be :
Answer» Two concentric thin conducting spherical shells having radius $R$ and $2 R$ are shown in figure. A charge $+ Q$ is given to shell $A$ and $- 4 Q$ is given to shell $B$ . Now shell $A$ and $B$ are connected by a thin conducting wire, then the final charge on the sphere $B$ will be :

Discussion

16289.	Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet lights are μr, μy and μv respectively and those for the flint glass are μ′r, μ′y and μ′v respectively. Find the A′A for which, there is no net angular dispersion.
Answer» Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet lights are $μ_{r}, μ_{y}$ and $μ_{v}$ respectively and those for the flint glass are $μ_{r}^{^{'}}, μ_{y}^{^{'}}$ and $μ_{v}^{^{'}}$ respectively. Find the $\frac{A^{^{'}}}{A}$ for which, there is no net angular dispersion.

Discussion

16290.	The VPI (vertical point of intersection) is 100 m away (when measured along the horizontal) from the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is200
Answer» The VPI (vertical point of intersection) is 100 m away (when measured along the horizontal) from the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is 200

Discussion

16291.	A car moves from X to Y with a uniform speed vu and returns to X with a uniform speed vd. The average speed for this round trip is:- (1) vu+vd/2 (2) 2vdvu/vd+vu (3) \sqrt{vuvd} (4) vdvu/vd+v
Answer» A car moves from X to Y with a uniform speed vu and returns to X with a uniform speed vd. The average speed for this round trip is:- (1) vu+vd/2 (2) 2vdvu/vd+vu (3) \sqrt{vuvd} (4) vdvu/vd+v

Discussion

16292.	The isothermal bulk modulus of a gas at atmospheric pressure is
Answer» The isothermal bulk modulus of a gas at atmospheric pressure is

16292.

The isothermal bulk modulus of a gas at atmospheric pressure is

Answer»

The isothermal bulk modulus of a gas at atmospheric pressure is

Discussion

16293.	A vessel of area of cross-section A has liquid upto a height H. A hole is made in the wall of vessel such that water coming out of it travels maximum horizontal distance of 2 m. Find the value of H.
Answer» A vessel of area of cross-section $A$ has liquid upto a height $H$ . A hole is made in the wall of vessel such that water coming out of it travels maximum horizontal distance of $2 m$ . Find the value of $H$ .

Discussion

16294.	Two walls of thickness d1 and d2, thermal conductivities K1 and K2 are in contact. In the steady state, if the temperature at the outer surfaces are T1 and T2, the temperature at the contact of the walls will be
Answer» Two walls of thickness $d_{1}$ and $d_{2}$ , thermal conductivities $K_{1}$ and $K_{2}$ are in contact. In the steady state, if the temperature at the outer surfaces are $T_{1}$ and $T_{2}$ , the temperature at the contact of the walls will be

Discussion

16295.	What is the minimum electrical force between two charged particles 1m apart in free space?
Answer» What is the minimum electrical force between two charged particles 1m apart in free space?

Discussion

16296.	Assume that the diode in the figure has Von=0.7V, but is ideal otherwise the magnitude of the current i (in mA) is equal to ___0.6
Answer» Assume that the diode in the figure has $V_{o n} = 0.7 V$ , but is ideal otherwise the magnitude of the current $i$ (in mA) is equal to ___ 0.6

Discussion

16297.	(i) Strongest reducing ion is(1) Fe2+(2) Mn2+(3) Cr2+(4) n3+
Answer» (i) Strongest reducing ion is(1) Fe2+(2) Mn2+(3) Cr2+(4) n3+

Discussion

16298.	34.Why deflection increases dramatically when iron rod is inserted into the coils along their axis??
Answer» 34.Why deflection increases dramatically when iron rod is inserted into the coils along their axis??

Discussion

16299.	if the radius of th earth is 6400 km,then its angular velocity
Answer» if the radius of th earth is 6400 km,then its angular velocity

Discussion

16300.	A bullet of mass 5 gm is fired from a gun of mass 5 kg. What is the velocity of the muzzle if the recoil velocity is 500 m/s?
Answer» A bullet of mass 5 gm is fired from a gun of mass 5 kg. What is the velocity of the muzzle if the recoil velocity is 500 m/s?

Discussion

Explore topic-wise InterviewSolutions in .

what is the meaning of beta decay in weak nuclear forces

A hollow sphere of radius r rolls without slipping in a hemisphere of radius 4r. Calculate the frequency of small oscillations, about point P as shown in figure.

A short bar magnet placed with its axis at 30∘ with a uniform external magnetic field of 0.16 T , experiences a torque of 0.032 Nm. If the bar magnet is free to rotate, its potential energy when it is in stable and unstable equilibrium are-

A dipole with dipole moment 3.60 nC−m is oriented at 60∘ to an electric field of magnitude 4×109 N/C, how much work is required to rotate the dipole until it is antiparallel to field.

A riffle of mass 25 kg fires at the rate of 6 bullets per second. If the mass of each bullet is 30 g and the velocity of the bullet when it leaves the gun is 1080 km/h, find the magnitude of average force required to hold the gun while firing (neglect recoil speed of riffle).

What are the merits of Dalton’s atomic theory?

What is momentum ?Why do we study momentum

the surface tension of water is 72 dyne/ cm.convert it in si uni

The percentage error in measuring resistance with meter-bridge can be minimized by adjusting the balance point close to

Consider two vectors →a=^i+^j,→b=2^i−^j and a third vector coplanar with →a and →b and also perpendicular to →a with unit magnitude. Then the third vector is

A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is

A bird is flying up at angle sin−1(3/5) with the horizontal. A fish in a pond looks at that bird. When it is vertically above the fish, the angle (in degrees) at which the bird appears to fly (to the fish) is [nwater=4/3]

Consider a PCM system wth n=8 bits/sample. It is intended to increase the signal to quantization noise ratio of the existing system by 6 dB, by increasing the value of n. Then the corresponding increment in the required channel bandwidth will be _______% 12.5

There is two metal oxide. The higher metal oxide consists of 80% metal. 0.72g of lower metal oxide give 0.8g of higher metal oxide. Calculate the ratio of the weights of the oxygen in both the metal oxides with a fixed weight of metal.

In the figure shown below, the block on the frictionless surface is having acceleration a towards left and the other block is having acceleration a′. Find the relation between the accelerations of the two blocks.

When frequency of RL circuit is doubled its impedance will beOptions:DoubledHalvedDecrease Increase

Electron with de-Broglie wavelength l fall on the target in an x-ray tube. The cut off wavelength of the emitted x-rays is:

A particle of unit mass undergoes one-dimensional motion such that its velacity varies according to {V(x)=Bx^{-2 , where β and n are constants and x is the position of the particle. The acceleration of the particle as a function of x, is given by

why does the total time of flight only depend on vertical motion in any projectile motion even in the inclined plane motion also?

A coil of 10^{-2 }H inductance carries a current I=2sin(100t)A when current is half of its maximum value then at that instant the induced emf in the coil Will be 1)1v 2)2v 3)3 4)2v

the momentum of a photon having energy equal to the rest energy of an electron i

If →A is parallel to→B then choose incorrect option (λ is positve constant)

3. When a particle is projected at some angle to the horizontal, it has a range R and time of flight t1. If the same particle is projected with the same speed at some other angle to have the same range, its time of flight is t2, then 1) t1 + t2 = 2R/g 2) t1 - t2 = R/g 3) t1t2 =2R/g 4) t1t2 = R/g

A short dipole is placed at origin of coordinate system in x-y plane as shown in figure. Find the electric field at point P(0, y). (y&gt;&gt; length of dipole)

Electric field is directed towards

Why is an atom indivisible?

A ball is projected with a velocity u at an elevation from a point distance d from a smooth vertical wall in a plane perpendicular to it. After rebounding from the wall, it returns to the point of projection, find the maximum distance d for which the ball can return to the point of projection.

32.If a person jumps 1 m on the earth, then he will jump 6 m at the surface of the moon. Therefore,the ratio of moon's acceleration due to gravity with Respect to earth's acceleration due to gravity would be

Consider the diagram below. If support B sinks by 5 mm, then slope of beam at support B will be×10−4 radian. 7.5

An ant slides from point (0, 0) to (3, 4, 6) under the wind force →F=(2x^i+4^j+6z^k). Find the work done by the force of wind in Joules. __

Following results areobserved when sodium metal is irradiated with different wavelengths.Calculate (a) threshold wavelength and, (b) Planck’s constant. λ (nm) 500 450 400 v × 10–5 (cm s–1) 2.55 4.35 5.35

Find derivative of f(x)=esinx+lnx+8x

Two concentric thin conducting spherical shells having radius R and 2R are shown in figure. A charge +Q is given to shell A and −4Q is given to shell B. Now shell A and B are connected by a thin conducting wire, then the final charge on the sphere B will be :

Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet lights are μr, μy and μv respectively and those for the flint glass are μ′r, μ′y and μ′v respectively. Find the A′A for which, there is no net angular dispersion.

The VPI (vertical point of intersection) is 100 m away (when measured along the horizontal) from the VPC (vertical point of curvature). If the vertical curve is parabolic, the length of the curve (in meters and measured along the horizontal) is200

A car moves from X to Y with a uniform speed vu and returns to X with a uniform speed vd. The average speed for this round trip is:- (1) vu+vd/2 (2) 2vdvu/vd+vu (3) \sqrt{vuvd} (4) vdvu/vd+v

The isothermal bulk modulus of a gas at atmospheric pressure is

A vessel of area of cross-section A has liquid upto a height H. A hole is made in the wall of vessel such that water coming out of it travels maximum horizontal distance of 2 m. Find the value of H.

Two walls of thickness d1 and d2, thermal conductivities K1 and K2 are in contact. In the steady state, if the temperature at the outer surfaces are T1 and T2, the temperature at the contact of the walls will be

What is the minimum electrical force between two charged particles 1m apart in free space?

Assume that the diode in the figure has Von=0.7V, but is ideal otherwise the magnitude of the current i (in mA) is equal to ___0.6

(i) Strongest reducing ion is(1) Fe2+(2) Mn2+(3) Cr2+(4) n3+

34.Why deflection increases dramatically when iron rod is inserted into the coils along their axis??

if the radius of th earth is 6400 km,then its angular velocity

A bullet of mass 5 gm is fired from a gun of mass 5 kg. What is the velocity of the muzzle if the recoil velocity is 500 m/s?

A short dipole is placed at origin of coordinate system in x-y plane as shown in figure. Find the electric field at point P(0, y). (y>> length of dipole)