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JAMB Physics 2005 Question 10

Question 10

Alternating Current Circuits

In an a.c. circuit that contains only a capacitor, the voltage lags behind the current by

  1. A.90°
  2. B.180°
  3. C.60°
  4. D.30°
Show the answer and explanation

Answer: A (90°)

Explanation

In a purely capacitive circuit the current leads the voltage by a quarter cycle, so the voltage lags by 90°.