A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies :-

A circular coil lies flat on a horizontal table. A bar magnet is held above its centre with its north pole pointing down. The stationary magnet induces (when viewed from above)Group of answer choicesno current in the coil.a clockwise current in the coil.a counterclockwise current in the coil.a current whose direction cannot be determined from the information given.

A long straight wire of circular cross section of radius a carries asteady current I. The current is uniformly distributed across itscross section. The ratio of the magnitudes of magnetic field at apoint distant a/2 above the surface of wire to that at a point distanta/2 below its surface is(i) 4 :1(ii) 1:1(iii) 4: 3(iv) 3 :4

A coil of wire with a current is often called an _________.

Calculate the intensity of magnetic induction at distance x𝑥 from the centre (x>>R)(𝑥>>𝑅) of a circular coil of radius R𝑅 carrying a current of I𝐼.

When current is flowing in a circular loop of wire, the associated magnetic field at its centre is