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When the current changes from +2 A to –2...

When the current changes from `+2 A to –2A` 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

A

0.2 H

B

0.4 H

C

0.8 H

D

0.1 H

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