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Class 12 Physics Practice Test: AC Voltage Applied to a Series LCR Circuit
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Avg score: 33% • Most missed: “Voltages across L and C in series are 90° out of phase.”
Class 12 Physics Practice Test: AC Voltage Applied to a Series LCR Circuit
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10 Questions

1. A resistor of 50 Ω, an inductor of \(\frac {20}{\pi}\) H and a capacitor of \(\frac {5}{\pi }\) μF are connected in series to a voltage supply of 230 V – 50 Hz. Find the impedance of the circuit.
2. An inductor coil joined to a 6 V battery draws a steady current of 12 A. This coil is connected in series to a capacitor and ac source of alternating emf 6 V. If the current in the circuit is in phase with the emf, find the rms current.
3. Voltages across L and C in series are 90° out of phase.
4. What is the reactance of an inductor in a dc circuit?
5. Determine the impedance of a series LCR-circuit if the reactance of C and L are 250 Ω and 220 Ω respectively and R is 40 Ω.
6. If a 0.5 H inductor, 80 μF capacitor and a 40 Ω resistor are connected in series with a 150 V, 60 Hz supply. Calculate the impedance of the circuit.
7. A series circuit with L = 0.12 H, C = 0.48 mF and R = 25 Ω is connected to a 220 V variable frequency power supply. At what frequency is the circuit current maximum?
8. When are the voltage and current in LCR-series ac circuit in phase?
9. A capacitor, resistor of 10 Ω, and an inductor of 70 mH are in series with an ac source marked 120 V, 70 Hz. If it is found that voltage is in phase with the current, then find out the impedance of the circuit.
10. If the frequency of the ac source in a series LCR-circuit is increased, how does the current in the circuit change?

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