Test Index

JAMB Physics 2018 Paper

Question : 25

Total: 87

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

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Solution:

Concept:

At resonance in a series R-L-C circuit, the inductive and capacitive reactances are equal, so the voltages across the inductor and capacitor are equal in magnitude.

Explanation:

Voltage across inductor,

V_L = 40\text{ V}

At resonance,

V_C = V_L

Therefore, voltage across capacitor,

V_C = 40\text{ V}

Answer:

D. 40V

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