Question

The back e.m.f induced in coil when electric charges from 1A to zero in millisecond is 4 volt. Find the self induction n(L) of coil.

Answer 1

Gives

$$i_2=1A,i_1=0A,t=1\times10^{-3}sec;e=4V$$

L=?

We know that

$e=L\frac{di}{dt}$

Put value

$L=\frac{e}{\frac{di}{dt}}$

$$L=\frac{4}{\frac{(1-0)}{1\times10^{-3}}}=4\times10^{-3}H$$

$L=4mH$