A ring of radius carries a charge Q uniformly distributed over its length. A charge q is placed at its centre will experience a force equal to

A ring of radius R having total charge Q uniformly distributed over the ring has a charge particle q kept at its centre. If a transverse pulse is created on the ring, then find the time when pulse completes one revolution.(Total mass of ring is m )

A ring of radius R carries a uniformly distributed charge +Q. A point charge -q is placed on the axis of the ring at a distance 2R from the centre of the ring and released from rest. The particle executes a simple harmonic motion along the axis of the ring. State True or False.

A solid sphere of radius R has charge q uniformly distributed over its volume. The distance from its surface at which the electrostatic potential is equal to half of the potential at the centre is

A solid sphere of radius R has charge q uniformly distributed over its volume. The distance from it surfce at which the electrostatic potential is equal to half of the potential at the centre is

A solid sphere of radius R has charge q uniformly distributed over its volume. The distance from it surfce at which the electrostatic potential is equal to half of the potential at the centre is

A ring of radius R has charge -Q distributed uniformly over it. Calculate the charge that should be placed at the center of the ring such that the electric field becomes zero at apoint on the axis of the ring at distant R from the center of the ring.

A wire of length l and charge q is bent in form of a semicircle. The charge is uniformly distributed over the length. The electric field at the centre of semicircle is

A ring of mass m, radius r having charge q uniformly distributed over it and free to rotate about its own axis is placed in a region having a magnetic field B parallel to its axis. If the magnetic field is suddenly switched off, the angular velocity acquired by the ring is:

A uniform rod of mass M and length L carrying a charge q uniformly distributed over its length is rotated with constant velocity w about its mid point perpendicular to the rod. Its magnetic moment is

A ring of radius a contains a charge q distributed. uniformly ober its length. Find the electric field at a point. on the axis of the ring at a distance x from the centre.