The instantaneous value of an $AC$ is given by $I = 5 \sin (\omega t + \phi) \text{ A}$. The rms value of current is

  • A
    $5 \text{ A}$
  • B
    $\frac{5}{\sqrt{2}} \text{ A}$
  • C
    $5 \sqrt{2} \text{ A}$
  • D
    $2.5 \text{ A}$

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