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General
Easy
Question
Charges +q and –q are placed at points A and B respectively which are a distance 2L apart, C is the midpoint between A and B. the work done in moving a charge +Q along the semicircle CRD is:
The correct answer is:
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A hollow cylinder has a charge q coulomb within it. If is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be:
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A square surface of side L metres is in the plane of the paper. A uniform electric electric field 
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To charges q1 and q2 are placed 30 cm apart, shown in the figure. A third charge q3 is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is 
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As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge —Q from the point A [co-ordinates (0, a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
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Figure shows three points A, B and C in a region of uniform electric field E. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where VA ,VB and VC represent the electric potential at points A, B and C respectively
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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
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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
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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 
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)
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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
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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.
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