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JAMB Physics 1999 Question 48

Question 48

Alternating Current Circuits

In a 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 across the capacitor?

  1. A.30 V
  2. B.40 V
  3. C.50 V
  4. D.70 V
Show the answer and explanation

Answer: B (40 V)

Explanation

At resonance XL = XC, and the same current flows through both, so VC = VL = 40 V.