Question

In $0.1s$, the current in a coil increases from $1A$ to $1.5A$. If inductance of coil is $60mH$, then induced current in external resistance of $3\Omega$ will be

• A. $1A$
• B. $0.5A$
• C. $0.2A$
• D. $0.1A$

Answer 1

The correct option is D $0.1A$

Induced emf is: $L\frac{di}{dt}=60\times \frac{1.5-1}{0.1}=300mV$

So, the current induced will be, $\frac{300}{3}=100mA=0.1A$