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  4. A long thin magnet of moment M is bent into a semi circle. The decrease in the Magnetic moment is

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Q. A long thin magnet of moment M is bent into a semi circle. The decrease in the Magnetic moment is

Moving Charges and Magnetism

Solution:

$M = \frac{2M}{\pi}$ decrease in magnetic moment
= $M - \frac{2M}{\pi}$