Question

In a series resonant circuit, VC = 300 V, VL = 300 V and VR = 100 V. What is the value of the source voltage?

(a) Zero

(b) 100 V

(c) 350 V

(d) 200 V

I got this question in my homework.

My query is from Problems Involving Dot Conventions topic in chapter Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

Correct answer is (b) 100 V

Best explanation: As VC and VL are equal, then XC is equal to XL and both the voltages are then cancelled out.

That is VS = VR

∴ VS = 100 V.