The back $e.m.f.$ induced in a coil,when current changes from $1 \ A$ to $0 \ A$ in $1 \ ms$,is $4 \ V$. The self-inductance of the coil is:
- A$1 \ H$
- B$4 \ H$
- C$10^{-3} \ H$
- D$4 \times 10^{-3} \ H$
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