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At a given instant the current and self-...

At a given instant the current and self-induced emf in an inductor are directed as indicated in Fig. 30-51. (a) ls the current increasing or decreasing? (b) The induced emf is 23 V, and the rate of change of the current is 18 kA/s, find the inductance.

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(a) decreasing, (b) 1.3 mH
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