27.46     A coil with magnetic moment 1.45 Amp-meter2 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 degrees so that its magnetic moment is parallel to the field?

Q: The bolt of lightnin; 133-turn coil orientec in the lightning bolt

A: Givend=100 mN=133 turnsChange in current, dI=5.22×106 Adt=10.9 μs=10.9×10-6 sr=0.881 m

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