Revolution, which maintains a constant current

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The coil, in which a constant current strength I = 60 A is maintained, is freely established in a uniform magnetic field (B = 20 mT). The diameter of the coil is d = 10 cm. What work A needs to be done in order to rotate the coil about an axis coinciding with the diameter through an angle of 60 degrees?

Problem 30025. A detailed solution with a brief note of the conditions, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
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