Question

A circular loop A of radius R carries a current I. Another circular loop B of radius r (= R/20) is placed concentrically in the plane of A. The magnetic flux linked with loop B is proportional to

Derive an expression for magnetic field on the axis of a current carrying circular loop.

Two circular loops A and B, each of radius 3 m, are placed coaxially at a distance of 4 m. They carry currents of 3 A and 2 A in opposite directions respectively. Find the net magnetic field at the centre of loop A.

State Biot-Savart's law for the magnetic field due to a current carrying element. Use this law to obtain an expression for the magnetic field at the centre of a circular loop of radius 'a' and carrying a current 'I'. Draw the magnetic field lines for a current loop indicating the direction of magnetic field.