Question

The current passing through a choke coil of 15 henry is decreasing at the rate of 0.2 ampere per second. The e.m.f. developed across the coil :

• A. 3 volt
• B. 7.5 volt
• C. 15 volt
• D. 30 volt

Answer 1

Answer: (A)

3 volt

Answer 2

$E = L \frac{dI}{dt}$, Here L = 15 H and $\frac{dI}{dt}$ = 0.2 A$s^{-1}$ this gives E = 3V