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If a rate of change of current of 4 `As^(-1)` induces an emf of 20 mV in a solenoid, the self inductance of the solenoid is

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If a rate of change of current of 4 `As^(-1)` induces an emf of 20 mV in a solenoid, the self inductance of the solenoid is
A. 3 mH
B. 4 mH
C. 5 mH
D. 6 mH
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Correct Answer - C
`e=L(dI)/(dt)`
`20xx10^(-3)=Lxx4`
`therefore L=mH`
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