In a purely resistive $ac$ circuit,the current

  • A
    Lags behind the $e.m.f.$ in phase
  • B
    Is in phase with the $e.m.f.$
  • C
    Leads the $e.m.f.$ in phase
  • D
    Leads the $e.m.f.$ in half the cycle and lags behind it in the other half

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