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A small coil of N turns has an effective...

A small coil of `N` turns has an effective area `A` and carries a current `I`. It is suspended in a horizontal magnetic field `vecB` such that its plane is perpendicular to `vecB`. The work done in rotating it by `180^(@)` about the vertical axis is

A

`NAIB`

B

`2NAIB`

C

`2 pi NAIB`

D

`4pi NAIB`

Text Solution

Verified by Experts

The correct Answer is:
B
`W_(1 rarr 2) = muB(cos theta_(1) - cos theta_(2))`
`= N i A B = (cos 0 - cos 180^(@))`
`= NiAB[1 - (-1)] = 2NiAB`
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