Question

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.

(a) 100 Ω

(b) 160.3 Ω

(c) 50 Ω

(d) 65 Ω

This question was addressed to me in an interview for internship.

The question is from AC Voltage Applied to a Series LCR Circuit in portion Alternating Current of Physics – Class 12

Answer 1

The correct option is (b) 160.3 Ω

Best explanation: Impedance, Z = √(R^2 + (XL – XC)^2.

Z = √40^2 + (188.4 – 33.17)^2

Z = 160.3 Ω