JAMB Physics
In the series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30 V and 40 V respectively. what is the voltage of across the capacitor?
a.
30 V
b.
70 V
c.
50 V
d.
40 V
Correct answer: D
When an AC circuit is at resonance, voltage across the inductor and the voltage across the capacitor are equal. Since the voltage across the inductor is 40V, the voltage across the capacitor will also be 40V.