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A closely wound coil has a radius of 4.0 cm, 50 turns, and a total resistance...

A closely wound coil has a radius of 4.0 cm, 50 turns, and a total resistance of 40 Ω. At what rate must a magnetic field perpendicular to the face of the coil change in order to produce Joule heating in the coil at a rate of 2.0 mW?

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