A series circuit has

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

R = 40\,\Omega

L = 0.20\,\text{H}

and

C = 100\,\mu\text{F}

and is supplied with an AC source of rms voltage

V

. Initially the supply frequency is

200\,\text{Hz}

. If the frequency is halved to

100\,\text{Hz}

while keeping

V

unchanged, what happens to the power factor of the circuit? (a) It decreases (b) It becomes zero (c) It increases (d) It remains unchanged