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When the current in a coil changes from `8A` to `2A` in `3xx10^(-2)s` , th eemf induced in the coil is `2V` . The self-induced of coil in `mH`

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When the current in a coil changes from `8A` to `2A` in `3xx10^(-2)s` , th eemf induced in the coil is `2V` . The self-induced of coil in `mH`
A. `10`
B. `20`
C. `30`
D. `40`
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Correct Answer - A
`bar(e)=-L(Deltai)/(Deltai)`
`2=-L((2-8))/(3xx10^(-2))`
`L=10^(-2)H=10mH`
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