For a domestic $AC$ supply of $220 \ V$ at $50 \ \text{cycles per sec}$, the potential difference between the terminals of a two-pin electric outlet in a room is given by
- A$V(t) = 220 \sqrt{2} \cos(100 \pi t)$
- B$V(t) = 220 \sin(50 t)$
- C$V(t) = 220 \cos(100 \pi t)$
- D$V(t) = 220 \sqrt{2} \cos(50 t)$
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