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In the device shown in Figure, when the current in the primary coil of 1000 turns increases linearly from 1A to 6A in 200ms, an e.m.f. of 15V is induced into the secondary coil of 480 turns, which is left open circuited. Determine
(a) The mutual inductance of the two coils,
(b) The reluctance of the former, and
(c) The self inductance of the primary coil.
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