The current in a coil falls from $5.0 \mathrm{~A}$ to $0.0 \mathrm{~A}$ in $0.1 \mathrm{~s}$. If average emf of $200 \mathrm{~V}$ is induced, the value of self inductance of coil is:

2 H 4 H 3 H 1 H

4 H

$ E = L \frac{\Delta I}{\Delta t} \Rightarrow 200 = L \frac{5}{0.1}$ $\Rightarrow L = 4 H$