The back e.m.f. induced in a coil, when current changes from 1 ampere to zero in one millisecond....

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The back e.m.f. induced in a coil, when current changes from 1 ampere to zero in one millisecond, is 4 volts, the self-inductance of the coil is
\( \mathrm{P} \)
(1) \( 1 \mathrm{H} \)
(2) \( 4 \mathrm{H} \)
(3) \( 10^{-3} \mathrm{H} \)
(4) \( 4 \times 10^{-3} \mathrm{H} \)


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