JAMB Physics 2019 Objective — Question 27

Question 27 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.

In an AC circuit that contains only a capacitor, the voltage

A. leads the current by 90°
B. lags the current by 90°Correct
C. leads the current by 180°
D. leads the current by 45°

Explanation

In a purely capacitive AC circuit, the current leads the voltage by 90° — equivalently, the voltage lags the current by 90°.

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