Physics

Problem

A series

R

–

L

–

C

circuit contains a

0.20\,\text{H}

inductor, a

50\,\mu\text{F}

capacitor and a

20\,\Omega

resistor connected to a

220\,\text{V}

(rms) AC mains supply whose frequency can be adjusted. a. (i) Calculate the frequency at which the circuit is in resonance. b. (ii) Find the rms current in the circuit at this frequency. c. (iii) Determine the rms current when the supply frequency is reduced to

75\%

of the resonant frequency.

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