Question

If the current flowing in a choke coil of $2H$ is decreasing at the rate of $5amp/s$, then induced emf across the ends of the coil will be

• A. ${10}^3$ volt
• B. $2.5volt$
• C. $10volt$
• D. $-2.5volt$

Answer 1

The correct option is C $10volt$

Induced voltage $=L\frac{dI}{dt}$
$=2\times 5=10V$