Question

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.

(a) 250 Ω

(b) 150 Ω

(c) 50 Ω

(d) 80 Ω

This question was addressed to me by my college director while I was bunking the class.

Origin of the question is AC Voltage Applied to a Series LCR Circuit topic in section Alternating Current of Physics – Class 12

Answer 1

The correct choice is (c) 50 Ω

The best I can explain: Z = √(R^2 + (XL – XC)^2

Z = √40^2 + (220 – 250)^2

Z = 50 Ω.s