For the circuit shown below in the figure, the voltage V0

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For the circuit shown below in the figure, the voltage V₀ is—

1. 2 V
2. 1 V
3. – 1 V
4. None of these

Correct Option: D

This question can be easily solve by using superposition theorem.
Case I. Take 4V source the circuit becomes neglecting the voltage drop across diode by applying potential divider method voltage drop across AB

V_AB =	2	x 4 = 2V
	2 + 2

Case II. Take 2 V source the circuit becomes due to 2V source there will be no current flowing through the terminal AB because diode becomes reverse bias under this situation.

Hence there will be no voltage drop across terminal AB due to this voltage source.
So net voltage = 2 V
But V₀ = – 2V (∵ as sign are opposite)
so, alternative (D) is the correct answer.