Question

Current in a circuit falls from $5.0A$ to $0.0A$ in $0.1s$. If an average emf of $200V$ induced, find an estimate of the self-inductance of the circuit.

Answer 1

The emf is related to inductance by the equation,

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

Now, $L=\frac{e}{\frac{di}{dt}}=\frac{200}{\frac{5}{0.1}}=4H$.