The voltage of an ac source varies with time according to the equation $V = 100\sin \;100\pi t\,\cos \,100\pi t$ where $t$ is in seconds and $V$ is in volts. Then

  • A

    The peak voltage of the source is $100$ volts

  • B

    The peak voltage of the source is $50$ volts

  • C

    The peak voltage of the source is $100/\sqrt 2 $ volts

  • D

    The frequency of the source is $50\, Hz$

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