The instantaneous values of current and potential difference in an alternating circuit are $i = \sin \omega t$ and $E = 100 \cos \omega t$ respectively. The $r.m.s.$ value of the wattless current (in $A$) in the circuit is:

  • A
    $1$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $100$
  • D
    zero

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