If instantaneous current is given by $i = 4\cos \,(\omega \,t + \phi )$ amperes, then the $r.m.s$. value of current is
If instantaneous current is given by $i = 4\cos \,(\omega \,t + \phi )$ amperes, then the $r.m.s$. value of current is
- A
$4$ amperes
- B
$2\sqrt 2 $ amperes
- C
$4\sqrt 2 $ amperes
- D
Zero amperes
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