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When the current changes fro +2A to -2A ...

When the current changes fro +2A to -2A in 0.05 s, an e.m.f. of 8 V is induced in the coil. The coefficient of self-indution of the coil is

A

0.2 H

B

0.4 H

C

0.8 H

D

0.1 H

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