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A varying current in a coil changes from 10 A to zero in 0.5 sec. If the average e.m.f induced in the coil is 220V, the self-inductance of the coil is
(a) 5 H
(b) 6 H
(c) 11 H
(d) 12 H
(c)
Initial current (I1) = 10 A; Final current
(I2) = 0; Time (t) = 0.5 sec and induced e.m.f.
(e) = 220 V.
Induced e.m.f. (E)
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