The current in a coil at time t is I = t...

The current in a coil at time t is `I = t^2e^(-t)`. The self inductance of the coil is `L= 2mH`. How much time it will take to e.m.f. be zero?

A

`0 sec`

B

`2 sec`

C

`4 sec`

D

`1 sec`

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