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Question

A small coin of N turns has an effective area A and carries a current I. It is suspended in a horizontal magnetic field B such that its plane is perpendicular to B.The work done in rotating it by 180 about the vertical axis is:

A
NAIB
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B
2NAIB
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C
2π NAIB
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D
4π NAIB
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Solution

The correct option is D 2NAIB
The work done in rotating the coin is given as:
W=MB(cosθ1cosθ2)

=(NiA)B(cos0ocos180o)

=2NAIB

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