On connecting a battery to the two corners of a diagonal of a square conductor frame of side `a` the magnitude of the magnetic field at the centre will be

A square loop of side a carris a current I . The magnetic field at the centre of the loop is

A square loop of side a carris a current I . The magnetic field at the centre of the loop is

The magnetic field at the centre of square of side a is

The magnetic field at the centre of square of side a is

A cell is connected across two points P and Q of a uniform circular conductor, figure. Prove that the magnetic field at its centre O will be zero.

A circular conductor of uniform resistance per unit length, is connected to a battery of 4 V. The total resistance of the conductor is 4omega . The net magnetic field at the centre of the conductor is

A circular conductor of uniform resistance per unit length, is connected to a battery of 4 V. The total resistance of the conductor is 4 ohm . The net magnetic field at the centre of the conductor is