In the circuit given below, the switch is closed at time t=0. The voltage across the inductance just at t=0^+ is ____________(a) 2 V(b) 4 V(c) -6 V(d) 8 VThis question was addressed to me during an interview.The above asked question is from Dot Convention in Magnetically Coupled Circuits topic in chapter Resonance & Magnetically Coupled Circuit of Network Theory

In the circuit given below, the switch is closed at time t=0. The volt

1.	In the circuit given below, the switch is closed at time t=0. The voltage across the inductance just at t=0^+ is ____________(a) 2 V(b) 4 V(c) -6 V(d) 8 VThis question was addressed to me during an interview.The above asked question is from Dot Convention in Magnetically Coupled Circuits topic in chapter Resonance & Magnetically Coupled Circuit of Network Theory
Answer» Correct ANSWER is (B) 4 V To elaborate: A t=0^+, I (0^+) = \(\frac{10}{4\|\|4+3} = \frac{10}{5}\) = 2A ∴ I2(0^+) = \(\frac{2}{2}\) = 1A VL(0^+) = 1 × 4 = 4 V.

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