The voltage of an $ac$ supply varies with time $(t)$ as $V = 120\sin 100\,\pi \,t\cos 100\pi \,t.$ The maximum voltage and frequency respectively are
The voltage of an $ac$ supply varies with time $(t)$ as $V = 120\sin 100\,\pi \,t\cos 100\pi \,t.$ The maximum voltage and frequency respectively are
- A
$120 \,volts, \,100 \,Hz$
- B
$\frac{{120}}{{\sqrt 2 }} \,volts, \,100 \,Hz$
- C
$60 \,volts, \,200 \,Hz$
- D
$60 \,volts, \,100 \,Hz$
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