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General
Easy
Question
A charge q is located at the centre of a cube. The electric flux through any face is
The correct answer is:
Related Questions to study
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Four charges +Q, –Q, + Q, –Q are placed at the corners of a square taken in order. At the centre of the square
Four charges +Q, –Q, + Q, –Q are placed at the corners of a square taken in order. At the centre of the square
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A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by
A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by
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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge –Q. The surface charge density on the inner and outer surfaces of the spherical shell will be
A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge –Q. The surface charge density on the inner and outer surfaces of the spherical shell will be
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The acceleration of an electron in an electric field of magnitude 50 V/cm, if e/m value of the electron is 
C/kg, is
The acceleration of an electron in an electric field of magnitude 50 V/cm, if e/m value of the electron is C/kg, is
physics-General
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In the rectangle, shown below, the two corners have charges q1 = –5mC and q2 = +2.0mC. The work done in moving a charge +3.0mC from B to A is (take =
)
In the rectangle, shown below, the two corners have charges q1 = –5mC and q2 = +2.0mC. The work done in moving a charge +3.0mC from B to A is (take =)
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A thin uniform rod of mass M and length L is hinged at its upper end, and released from rest in a horizontal position. The tension at a point located at a distance L/3 from the hinge point, when the rod becomes vertical, will be
A thin uniform rod of mass M and length L is hinged at its upper end, and released from rest in a horizontal position. The tension at a point located at a distance L/3 from the hinge point, when the rod becomes vertical, will be
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Uniform rod AB is hinged at end A in horizontal position as shown in the figure. The other end is connected to a block through a massless string m as shown. The pulley is smooth and massless. Masses of block and rod is same and is equal to m. Then acceleration of block just after release from this position is
Uniform rod AB is hinged at end A in horizontal position as shown in the figure. The other end is connected to a block through a massless string m as shown. The pulley is smooth and massless. Masses of block and rod is same and is equal to m. Then acceleration of block just after release from this position is
physics-General
physics-
A child with mass m is standing at the edge of a mery-go-round having moment as shown in the figure. The 
of inertia I, radius R and initial angular velocity child jumps off the edge of the merry-go-round with tangential velocity v with respect to the ground. The new angular velocity of the merry-go-round is :
A child with mass m is standing at the edge of a mery-go-round having moment as shown in the figure. The of inertia I, radius R and initial angular velocity child jumps off the edge of the merry-go-round with tangential velocity v with respect to the ground. The new angular velocity of the merry-go-round is :
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Two balls each of mass 2 kg are fastened to the opposite ends of a massless rod of length 4 m. The rod is pivoted on a fixed axis through its centre. The ball and the rod are initially at rest. A 2 kg block moving with some initial velocity hits the lower ball and stick to it as shown in the figure. After collision, the system has an angular velocity 2 ms–1 about the pivot. The rod stops rotating when the lower mass is at the height.
Two balls each of mass 2 kg are fastened to the opposite ends of a massless rod of length 4 m. The rod is pivoted on a fixed axis through its centre. The ball and the rod are initially at rest. A 2 kg block moving with some initial velocity hits the lower ball and stick to it as shown in the figure. After collision, the system has an angular velocity 2 ms–1 about the pivot. The rod stops rotating when the lower mass is at the height.
physics-General
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A massless rod of length 2R can rotate about a vertical axis through its when w centre as shown in the Fig The system rotates at angular velocity the two masses m are at a distance R from the axis. The masses are simultaneously pulled to distance of R/2 from the axis by a force F directed along the rod. The new angular velocity of the system is
A massless rod of length 2R can rotate about a vertical axis through its when w centre as shown in the Fig The system rotates at angular velocity the two masses m are at a distance R from the axis. The masses are simultaneously pulled to distance of R/2 from the axis by a force F directed along the rod. The new angular velocity of the system is
physics-General
physics-
A particle P with a mass 2.0 kg has position vector r = 3.0 m and velocity V = 4.0 m/s as shown. It is accelerated by the force F = 2.0N. All three vectors lie in a common plane. The angular momentum vector is
A particle P with a mass 2.0 kg has position vector r = 3.0 m and velocity V = 4.0 m/s as shown. It is accelerated by the force F = 2.0N. All three vectors lie in a common plane. The angular momentum vector is
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A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
A uniform rod of length L and mass M is free to rotate about a frictionless pivot at one end as shown in the figure. The rod is released form rest in the horizontal position
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physics-
Two boys of equal masses m walk symmetrically on a uniform horizontal plank, which is hinged at mid-point. The graph of force applied by hinge on plank (N) v/s x is
Two boys of equal masses m walk symmetrically on a uniform horizontal plank, which is hinged at mid-point. The graph of force applied by hinge on plank (N) v/s x is
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physics-
Moment of inertia of a rod of mass m and length l about its one end is I. If one fourth of its length is cut away then moment of inertia of the remaining rod about its one end will be
Moment of inertia of a rod of mass m and length l about its one end is I. If one fourth of its length is cut away then moment of inertia of the remaining rod about its one end will be
physics-General
physics-
A wheel comprises of a ring having mass 2m and two rods (mass m and length l) along two diameters as shown. Find moment of inertia of the wheel about an axis passing through point P and perpendicular to the plane of wheel.
A wheel comprises of a ring having mass 2m and two rods (mass m and length l) along two diameters as shown. Find moment of inertia of the wheel about an axis passing through point P and perpendicular to the plane of wheel.
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