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A loop of wire of radius = 40. has an electrical resistance = 0.039 . The loop is initially inside a uniform magnetic field of magnitude = 1.8 parallel to the loop's axis. The magnetic field is then reduced slowly at a constant rate, which induces a current = 0.20 in the loop. How long does it take for the magnitude of the uniform magnetic field to drop from 1.8 to zero?

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