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

`NAlB`

`2NAlB`

`2piNAIB`

`4piNAIB`

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