Q. If a current of $3.0\ amperes$ flowing in the primary coil is reduced to zero in $0.001\ second$, then the induced e.m.f. in the secondary coil is $15000\ volts$. The mutual inductance between the two coils is
A) $0.5\ henry$
B) $5\ henry$
C) $1.5\ henry$
D) $10\ henry$
Explanation
(b) $e = M\frac{di}{dt} \Rightarrow M = \frac{15000}{3} \times 0.001 = 5\ H$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.