Two identical circular coils of radius 0.1m, each having 20 turns are mounted co-axially 0.1m apart. A current of 0.5A is passed through both of them (i) in the same direction, (ii) in the opposite directions. Find the magnetic field at the centre of each coil.

Two identical circular oils of radius 0*2m each having 30 turns are mounted coaxially 0*2m apart. What is the magnetic field at the centre of each coil when a current of 0*6A is passed through both the coils (a) in the same direction (b) in the opposite directions?

Two circular coils of wire each having a radius of 4cm and 10 turns have a common axis and are 3cm apart If a current of 1A passes through each coil in the opposite direction find the magnetic induction (i) At the center of either coil (ii) At a point on the axis, midway between them .

Two identical current carrying coils of radius 10 cm each are placed coaxially 0.5 m apart. Find the magnetic fields at the centre of each coil if a current of 0.5 A is passed through each of them in opposite directions. Assume that each coil is made of a single turn.

The radii of two concentric coils having same number of turns are 10 cm and 20 cm respectively. Equal currents are passed through them first in same direction and then in opposite direction. In these two conditions the ratio of resultant magnetic fields at the centre will be -

A circular coil is lying in a horizontal plane. The coil has 20 turns with each turn of radius 10 cm. For an observer above the coil, the current of 5 A appears to flow in the anticlockwise direction. What is the magnitude and direction of magnetic field at the centre of the coil?

The plane of a circular coil is horizontal. It has 10 turns each of radius 8cm. A current of 2 A flows through it. The current appears to flow clockwise from a point above the coil. Find the magnitude and direction of magnetic field at the centre of the coil due to the current.

A circular coil of average radius 6 cm has 20 turns. A current 1.0 A is set up through it. Find the magnetic induction at (i) The centre of the coil

A wire of length L is bent around in the form of a coil having N turns of same radius . If a steady current I flows through it in a clockwise direction, find the magnitude and direction of the magnetic field produced at its centre.

An average induced emg of 0.20 V appears in a coil when the current in it is changed from 5.0 A in one direction to 5.0 A in the opposite direction in 0.20 s. find the self inductance of the coil.

A circular coil of 0.2 m diameter has 100 turns and carries a current of 0.1 ampere. The intensity of magnetic field at the centre of the coil is -