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A mentallic wire is folded to from a squ...

A mentallic wire is folded to from a square loop of a . It crries a cureent i and is kept perpendicular to unifrom magnetic field . If the shape of the loop changed from squre to a circle without changing length of the wire and current, the amount of wire done in doing so is

Text Solution

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W = Find P.E - initial P.E
`W=-M_(f)B-(-M_(i)B)`
`W=iB(A_(i)-A_(f)) W=iBa^(2)[1-4/pi]`
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-III
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