Q. The magnetic flux linked with the coil varies with time as $\phi = 3t^{2} + 4t + 9.$ the magnitude of the induced emf at 2 s is
A) 9 V
B) 16 V
C) 3 V
D) 4 V
Explanation
(b) $e = \frac{d\phi}{dt} = 6t + 4 + 0$
At $t = 2\ s,\ \ e = 6 \times 2 + 4 = 16\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.