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A north pole of strengt` pi A m`, is moved around a circle of radius `10cm` which lies around a long straight conductor carrying a current of `10A`. T

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A north pole of strengt` pi A m`, is moved around a circle of radius `10cm` which lies around a long straight conductor carrying a current of `10A`. The work doen is nearly
A. `4 mu J`
B. `80 mu J`
C. `400 mu J`
D. `0.4 mu J`
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1 Answer

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Correct Answer - 2
`W=mu_(0)m n i`
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