
An electric dipole is placed at the centre of a sphere. Mark the correct answer :


Important Questions on Electrostatics


A bullet of mass and charge is fired towards a solid uniformly charged sphere of radius and total charge . If it strikes the surface of sphere with speed , find the minimum value of so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces)

A unit positive point charge of mass is projected with a velocity v inside the tunnel as shown. The tunnel has been made inside a uniformly charged non-conducting sphere of volume charge density . The minimum velocity with which the point charge should be projected such that it can it reach the opposite end of the tunnel, is equal to:

Three concentric conducting spherical shells have radius and and and are final charges, respectively. Innermost and outermost shells are already earthed as shown in figure. choose the wrong statement.



and are large, parallel conducting plates closed to each other. Each face has an area is given a charge . is without any charge. Points and are as shown in figure:
