Q. A coil having an area $A_{0}$ is placed in a magnetic field which changes from $B_{0}$ to $4B_{0}$ in a time interval $t$. The e.m.f. induced in the coil will be
A) $\frac{3A_{0}B_{0}}{t}$
B) $\frac{4A_{0}B_{0}}{t}$
C) $\frac{3B_{0}}{A_{0}t}$
D) $\frac{4B_{0}}{A_{0}t}$
Explanation
(a) $e = - \frac{d\phi}{dt} = \frac{- 3B_{0}A_{0}}{t}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.