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A coil with magnetic moment 1.45 A -m^2 ...

A coil with magnetic moment `1.45 A -m^2` is oriented initially with its magnetic moment antiparallel to a uniform `0.835 T` magnetic field. What is the change in potential energy of the coil when it is rotated `180^@` so that its magnetic moment is parallel to the field?

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The correct Answer is:
`[-2.42 J]`
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