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
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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