A rectangular coil of dipole moment fi, free to rotate, is placed in a uniform magnetic field B with its plane parallel to the magnetic lines of force. Then, the coil will

When a current is passed through a suspended moving-coil galvanometer, the deflection of the coil is arrested by

When a current is passed through a suspended moving-coil galvanometer, the deflection of the coil is 9. Then, in the usual notation, the expression is

Two circular coils 1 and 2 have both their radii and number of turns in the ratio 1 : 2. If the currents in them are in the ratio 2: 1, the magnitudes of the magnetic inductions at the centres of the coils are in the ratio

A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled?

 The nature of parallel and anti-parallel currents are

A current carrying loop is placed in a uniform magnetic field. The torqe acting on it does not depend upon

The conversion of a moving coil galvanometer into a voltmeter is done by

A strong magnetic field is applied on a stationary electron. Then the electron

Which one of the following is correct statement about magnetic forces?