A flat circular fixed disc has charge +Q uniformly distributed on the disc. A charge +q is thrown with kinetic energy K, towards the disc along its axis. The charge q :

A plastic disc of radius 'R' has a charge 'q ' uniformly distributed over its surface. If the disc is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

A plastic disc of radius 'R' has a charge 'q ' uniformly distributed over its surface. If the disc is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

Charge q is uniformly distributed on a disc of radius r. If the disc is rotated with a frequency v, then magnetic field induction at the centre will be

A plastic disc of radius 'R' has a charge 'q' uniformly distributed over its surface. If the dis is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

A positive charge Q is uniformly distributed along a circular ring of radius R .a small test charge q is placed at the centre of the ring .The

A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring.

A thin annular disc of outer radius R and R/2 inner radius has charge Q uniformly distributed over its surface. The disc rotates about its axis with a constant angular velocity omega . Choose the correct option(s):

A thin annular disc of outer radius R and R/2 inner radius has charge Q uniformly distributed over its surface. The disc rotates about its axis with a constant angular velocity omega . Choose the correct option(s):

Calculate potential on the axis of a ring due to charge Q uniformly distributed along the ring of readius R.