Physics - Capacitor Question with Solution | TestHub

An air-filled parallel-plate capacitor with the plate area A is connected to a battery of electromotive force V and negligible internal resistance. One of the plates is made to vibrate so that the distance between the plates varies as $\mathrm{d}={\mathrm{d}}_0+\mathrm{acos}\omega \mathrm{t}$, where $\mathrm{a}\ll {\mathrm{d}}_0$. If instantaneous current in the circuit reaches a maximum value of ${\mathrm{l}}_0$, then the maximum possible amplitude of vibrations a is