A small coil is positionaed so that its axis lies along the axis of a large bar agnet, as shown in the figure.
The coil has a cross-sectional area of `0.40 cm^2` and contains 150 turns of wire. The average magnetic flux density B through the coil aries with the distance x between the face of the magnet and the plane of the coil as shown in the figure.
The coil is 5.0 cm from the face of the magnet to determine the magnetic flux density in the coil.

A small retangular coil ABCD contains 140 turns of wire. The sides AB and BC of the coil are of length 4.5 and 2.8 cm respectively, as shown in the figure The coil is held between the poles of a large magnet so that the coil can rotate about an axis thorugh its centre. The magnet produces a uniform magnetic field of flux density B between its poles. When the current in the coil is 170 mA, the maximum torque produced in the coil is 2.1 xx 10^-3 N m . Use your answer to show that the magnetic flux density B between the poles of the magnet is 70 mT.

Two coils of wire A and B are placed mutaully perpendicular as shown in the figure. When current is changed in any one coil, will the current be induced in another coil?

A magnetic flux of 5 microweber is linked with a coil when a current of 1 MA flows through it.What is the self inductance of the coil ?