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JAMB Physics 1997 Question 48

Question 48

Alternating Current Circuits

In a purely inductive circuit, the current

  1. A.lags behind the voltage in phase by 90°
  2. B.leads the voltage in phase by 90°
  3. C.is in the same phase with the voltage
  4. D.leads the voltage by 180°
Show the answer and explanation

Answer: A (lags behind the voltage in phase by 90°)

Explanation

An inductor opposes changes in current, so in a pure inductor the current lags the voltage by 90°.