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The arrangement is as shown below F...

The arrangement is as shown below

Find the work done to increase the spacing between the wire and the loop from a to 2a.

Text Solution

Verified by Experts

`U_(i)=-(mu_(0))/(4pi)2i_(1)i_(2)llog_(e)((a+b)/(a))`
`U_(f)=-(mu_(0))/(4pi)2i_(1)i_(2)l(log_(e).(2a+b)/(2a))`
`therefore W=DeltaU=U_(f)-U_(i)=(mu_(0))/(4pi)2i_(1)i_(2)llog_(e)((2(a+b))/(2a+b))`
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