An inductor and a resistor are connected in series to an $AC$ source. If the power factor of the circuit is $0.5$, the ratio of the resistance of the resistor and the reactance of the inductor is:

  • A
    $1:1$
  • B
    $1: \sqrt{2}$
  • C
    $1: \sqrt{3}$
  • D
    $1: 2$

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