First slide
The bar magnet
Question

A thin bar magnet is bent in the form of a semicircle  and  its magnetic moment is M. If it is straightened and given a shape of an arc which subtends an angle 1200 at the center then its new magnetic moment will be 

Moderate
Solution

When a bar magnet of moment M0 is bent in the form of an arc its moment becomes 2M0sinθ2θ where θ is the angle subtended at the center. here θ in the first case is 1800 and second case it is 1200

 M'M=sin1202sin1802180120=3232=334  

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