Question

A current of $2A$ is increasing at a rate of $4A/s$ through a coil of inductance $1H.$ Find the energy stored in the inductor per unit time in the units of $J/s.$

• A. $8$
• B. $2$
• C. $4$
• D. $6$

Answer 1

The correct option is A $8$

Power supplied to the inductor is $P=Li\frac{di}{dt}$
Energy stored in inductor is $E=Pt$
Energy stored in inductor per unit time is $\frac{E}{t}=P=Li\frac{di}{dt}=1\times 2\times 4=8J{s}^{-1}$