Q. A coil having an area $2m^{2}$ is placed in a magnetic field which changes from $1Wb/m^{2}$ to $4Wb/m^{2}$ in an interval of $2\ second$. The e.m.f. induced in the coil will be
A) $4\ V$
B) $3\ V$
C) $1.5\ V$
D) $2\ V$
Explanation
(b) $|e| = A.\frac{\mathrm{\Delta}B}{\mathrm{\Delta}t} = 2 \times \frac{(4 - 1)}{2} = 3V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.