Q. The current through choke coil increases from zero to 6 $A$ in $0.3\ seconds$ and an induced e.m.f. of 30 $V$ is produced. The inductance of the coil of choke is
A) $5\ H$
B) $2.5\ H$
C) $1.5\ H$
D) $2\ H$
Explanation
(c) $|e| = L\frac{di}{dt} \Rightarrow 30 = L \times \frac{(6 - 0)}{0.3} \Rightarrow L = 1.5\ H$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.