RE-NEET 2026 Physics Induced EMF and Current MCQ Question

The power $P$ dissipated in the loop is related to the rate of change of magnetic flux through it, given by Faraday's law of electromagnetic induction. The area $A$ varies with time as $A = A_0(1 + \sin t)$, leading to a time-varying magnetic flux. The induced EMF $\mathcal{E}$ is proportional to the rate of change of area, thus $\mathcal{E} \propto \cos t$.

The power dissipated is given by $P = \frac{\mathcal{E}^2}{R}$, where $R$ is the resistance. Since $\cos^2 t$ oscillates between 0 and 1, $P$ will have a minimum at $t = \frac{\pi}{2} + n\pi$ and maximum at $t = n\pi$.

Option A correctly shows this behavior, while the other options fail to represent the oscillatory nature of $P$.