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The effective radius of a circular coil ...

The effective radius of a circular coil is R and number of turns is N. The current through it is i ampere. The work done is rotating the coil from angle `theta = 0^(@)` to `theta = 180^(@)` in an external magnetic field B will be -

A

`piNIR^(2)B`

B

`2piNiE^(2)B`

C

`((2NiB))/(piR ^(2))`

D

Zero

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The correct Answer is:
B
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