The current flowing through a circuit is changing at a rate of $6.0 \mathrm {~A} / \mathrm { s }$. If the circuit contains a $190 - \mathrm { H }$ inductor, what is the emf across the inductor?
A) $32 \mathrm { mV }$
B) $11 \mathrm { mV }$
C) $32 \mathrm {~V}$
D) $1100 \mathrm {~V}$

Question

Quizplus · Accepted Answer

The emf across an inductor is given by $ \text{emf} = L \frac{di}{dt} $. Substituting $ L = 190 \, \text{H} $ and $ \frac{di}{dt} = 6.0 \, \text{A/s} $, we get $ \text{emf} = 190 \times 6 = 1140 \, \text{V} $, which is closest to 1100 V.

The Current Flowing Through a Circuit Is Changing at a Rate