engineering physics MCQ #34

In a series LCR circuit, the voltage across the inductor is 100 V, across the capacitor is 100 V, and across the resistor is 50 V. The supply voltage is

engineering physics MCQ #34

Question 1
Q1. In a series LCR circuit, the voltage across the inductor is 100 V, across the capacitor is 100 V, and across the resistor is 50 V. The supply voltage is
- A) 50 V
- B) 50 √2 V
- C) 100 V
- D) 150 V
Answer: 50 √2 V
Explanation: VL = VC, so net voltage across LC is 0, hence V = √(VR²) = VR = 50 V is incorrect. Correct is V = √(VR² + (VL - VC)²) = VR = 50 V.