A small signal voltage $V(t)=V_{0} \sin \omega t$ is applied across an ideal capacitor $C$\

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(d) : When an ideal capacitor is connected with an ac voltage source, current leads voltage by $90^{\circ}$. Since, energy stored in capacitor during charging is spent in maintaining charge on the capacitor during discharging. Hence over a full cycle the capacitor does not consume any energy from the voltage source.\