Question

In the circuit given below, for time t<0, S1 remained closed and S2 open., S1 is initially opened and S2 is initially closed. If the voltage V2 across the capacitor C2 at t=0 is zero, the voltage across the capacitor combination at t=0^+ will be ____________

(a) 1 V

(b) 2 V

(c) 1.5 V

(d) 3 V

I had been asked this question during an interview.

The origin of the question is Dot Convention in Magnetically Coupled Circuits topic in division Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

Correct answer is (d) 3 V

Explanation: When S1 is closed and S2 is open,

VC1 (0^–) = VC1 (0^+) = 3V

When S1 is opened and S2 is closed, VC2 (0^+) = VC2 (0^+) = 3V.