Question

Which among the following is the correct expression for finding capacitive reactance for an ac circuit containing capacitor only?

(a) Xc = 2πf

(b) Xc = \(\frac {1}{2πfC}\)

(c) Xc = 2πfC

(d) Xc = \(\frac {2πf}{C}\)

This question was addressed to me during an interview for a job.

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

Answer 1

Right choice is (b) Xc = \(\frac {1}{2πfC}\)

Explanation: For an ac circuit containing capacitor only,

Xc = \(\frac {1}{\omega_C}\)

Xc = \(\frac {1}{2πfC}\).