Q. Lenz’s law is expressed by the following formula (here $e =$ induced e.m.f., $\phi =$ magnetic flux in one turn and $N =$ number of turns)
A) $e = - \phi\frac{dN}{dt}$
B) $e = - N\frac{d\phi}{dt}$
C) $e = - \frac{d}{dt}\left( \frac{\phi}{N} \right)$
D) $e = N\frac{d\phi}{dt}$
Explanation
The correct answer is Option B: $e = - N\frac{d\phi}{dt}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.