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A coil with a magnetic moment of 1.41 A?m2 is oriented initially with its magnetic moment...

A coil with a magnetic moment of 1.41 A?m2 is oriented initially with its magnetic moment antiparallel to a uniform magnetic field of magnitude 0.845 T .

Part A

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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