A charge -2 coulombs is at centre of semicircular wire of radius `pi` meters Another charge 2 coulombs is uniformly distributed on the wire. The dipole moment of the system is

A uniform current I is flowing in a long wire of radius R . If the current is uniformly distributed across the cross-sectional area of the wire, then

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field vecE at the centre O is

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 short electric dipole is placed at a distance x from centre O on the axis of a ring of radius R and charge Q is uniformly distributed over tis. The net force acting on the dipole will be

A long straight wire of a circular cross section (radius a ) carrying steady current. Current is uniformly distributed in the wire. Calculate magnetic field inside the region (r lt a) in the wire.

A short electric dipole is placed at a distance x from centre O on the axis of a ring of radius R and charge Q is uniformly distributed over tis. [(a) (find the net force acting on the dipole b) The work done external agent in rotating the dipole through 180^(@) would be

A charge of Q coulomb is placed on a solid piece of metal of irregular sphase. The charge will distribute itself

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 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

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