Question

A 1.50 μF capacitor is connected to a 220 V, 50 Hz source. If the frequency is doubled, what happens to the capacitive reactance?

(a) Remains the same

(b) Doubled

(c) Halved

(d) Becomes zero

This question was posed to me by my college professor while I was bunking the class.

This intriguing question originated from AC Voltage Applied to a Capacitor topic in portion Alternating Current of Physics – Class 12

Answer 1

Correct answer is (c) Halved

For explanation I would say: When the frequency is doubled, the capacitive reactance will be halved. This is because the capacitive reactance (Xc) is inversely proportional to the frequency (f). This is the effect of capacitive reactance on frequency.