Question

The magnitude of the induced emf in a coil of inductance $30mH$ in which the current changes from $6A$ to $2A$ in $2s$ is:

• A. $0.06V$
• B. $0.6V$
• C. $1.06V$
• D. $6V$

Answer 1

The correct option is A $0.06V$

Induced emf is given by:

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

$=-30\times {10}^{-3}\times \frac{4}{2}$

$=0.06V$