Choose the instantaneous power of a pure capacitive 1-ϕ ac circuit, if Vm, Im and f are peak voltage, peak current and frequency of sinusoidal supply.

1
0.5 VmIm sin πft
2
-0.5 VmIm sin 2πft
3
0.5VmIm sin 4πft
4
0.5VmIm sin 2πft

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