The phase difference between the voltage and the current in an $AC$ circuit is $\pi / 4$. If the frequency is $50 \ Hz$,then this phase difference will be equivalent to a time of:

  • A
    $0.02 \ s$
  • B
    $0.25 \ s$
  • C
    $2.5 \ ms$
  • D
    $25 \ ms$

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