Question

A voltage having the waveform of a sine curve is applied across a capacitor. When the frequency of the voltage is increased, what happens to the current through the capacitor?

(a) Increases

(b) Decreases

(c) Remains same

(d) Is zero

The question was posed to me in an interview for job.

This interesting question is from Problems Involving Standard Time Functions topic in division Application of the Laplace Transform in Circuit Analysis of Network Theory

Answer 1

The correct choice is (a) Increases

Easy explanation: The current through the capacitor is given by,

IC = ωCV cos (ωt + 90°).

As the frequency is increased, IC also increases.