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An inductor-coil of inductance 20 mH hav...

An inductor-coil of inductance `20 mH` having resistance `10 Omega` is joined to an ideal battery of `emf 5.0 V`.Find the rate of change of the magnitude of induced `emf` at (a)`t=0`,(b)`t=10 ms`.

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The correct Answer is:
`(a)-2.5xx10^(3)V//s " " (b) -2.5xx10^(3)xxe^(-5) V//s`
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