In a pure inductive circuit or in an $ac$ circuit containing inductance only,the current

  • A
    Leads the e.m.f. by $90^{\circ}$
  • B
    Lags behind the e.m.f. by $90^{\circ}$
  • C
    Sometimes leads and sometimes lags behind the e.m.f.
  • D
    Is in phase with the e.m.f.

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