Charge `Q` is uniformaly distributed on a thin insulating ring of mass `m` which is initially at rest. To what angular velocity will the ring be accelerated when a magnetic field `B`, perpendicular to the plane of the ring, is switched on ?

Charge Q is uniformly distributed on the rim of a thin insulating disc of mass m which is initially at rest and placed on a smooth horizontal surface. What will be the angular velocity of the disc if a magnetic field B , perpendicular to the plane of the disc is switched on ?

Charge Q is uniformly distributed on the rim of a thin insulating disc of mass m which is initially at rest and placed on a smooth horizontal surface. What will be the angular velocity of the disc if a magnetic field B , perpendicular to the plane of the disc is switched on ?

Charge q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

Charges q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

Charges q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

Electric charge Q is uniformly distributed around a thin ring of radius a. find the potential a point P on the axis of the ring at a distance x from the centre of the ring .