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When the current changes from +2 ~A to -2 ~A in 0.05 second, an e.m.f. of 8 ~V is induced in a coil. The coefficient of self-induction of the coil is

Options

  1. A0.2 H
  2. B0.4 H
  3. C0.8 H
  4. D0.1 H

Correct answer

D. 0.1 H

Step-by-step solution

e=- L dl dt 8=( L ) 2-(-2) 0.05 L =0.1 H

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