Q 12-06-011NEETJEE MainEasy
The magnetic flux through a coil varies as $\phi = (3t^2 + 2t)$ mWb, with $t$ in seconds. The induced emf at $t = 2$ s is
Answer: (A) $14$ mV
Concept. $|\varepsilon| = \dfrac{d\phi}{dt}$.
Step 1. Differentiate. $\dfrac{d\phi}{dt} = 6t + 2$ mV.
Step 2. At $t = 2$ s. $14$ mV.
Answer. $14$ mV (Option A).
Solution by Sreeraj P, M.Sc Physics