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A bar magnet of magnetic moment M is bent into a semicircle. What is its new magnet moment ? |
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Answer» Solution :Initial magnetic moment , M =2l m Where .2l. is the LENGTH of the magnet and .m is the POLE strength . when the magnet is bent in the form of a semicircle of radius .r. the distance between the poles =2r But the length of the magnet , `2l= PI r ` `IMPLIESR= (2l)/(pi)` `:.` Length of the new magnet= Distancebetween the poles `=2.(2l)/(pi) ` New magnetic moment `, M^(1) = 2 xx (2l)/(pi) xx m = (2M)/(pi)` . |
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