In a series $LCR$ circuit,resonance occurs at frequency $f = f_0$. If at this moment the amplitude of current is $I_0$,then calculate the wattless current at the same moment.

  • A
    $\sqrt{2} I_0$
  • B
    $\frac{I_0}{\sqrt{2}}$
  • C
    $\frac{I_0}{2\sqrt{2}}$
  • D
    Zero

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