Physics

Problem

A series LCR circuit has

R = 20\,\Omega

and is connected to a

100\,\text{V}

(rms) AC mains. Before tuning, the rms current in the circuit is

2\,\text{A}

. After adjusting the frequency to resonance, the percentage rise in rms current is closest to a)

60\%

150\%

250\%

100\%