A bar magnet has pole strength 4.5Am, magnetic length 12cm and cross sectional area `0.9cm^2.` Find intensity of magnetisation (I).

A bar magnet has pole strength 4.5Am, magnetic length 12cm and cross sectional area 0.9cm^2. Find magnetising intesity (H) at the centre

Two thin bar magnets of pole strengths 4Am and 7Am respectively and length 0.21m and 0.12m respectively are placed at right angles to each other with the N-pole of first angles to each other with the N-pole of first touching the S-pole of the second. Find the magnetic moment of the system.

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.

Length of rectangle 15 cm has its area 150" cm"^2 . Find its breadth.

A bar magnet has a magnetic moment of 10 A m^2 . If its magnetic length is 5 cm, calculate its pole strength.