A small signal voltage `V(t)=V_(0)sin omegat` is applied across an ideal capacitor `C`:

Options

A. Current I(t) is in phase with voltage V(t).
B. Current I(t) leads voltage V(t) by `180^@`
C. Current I(t), lags voltage V(t) by `90^@`.
D. Over a full cycle the capacitor C does not consume any energy from the voltage source.

Answer

D

Explanation

When an ideal capacitor is connected with an ac voltage source, current leads voltage by `90^@`. 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.