The part of a circuit shown in the figure consists of two ideal diodes and a few resistors. The equivalent resistance of the circuit between $A$ and $B$ is

Question

The part of a circuit shown in the figure consists of two ideal diodes and a few resistors. The equivalent resistance of the circuit between A and B is

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Correct answer: (C) 4 Ω or 13 Ω. If V_A>V_B, both the junction diodes are forward biased and the given circuit diagram becomes a balanced Wheatstone bridge. The equivalent resistance, in this case, becomes 4 Ω. If V_B>V_A, the diodes are reverse biased. In that case, 4 Ω, 5 Ω and 4 Ω are in series.

The part of a circuit shown in the figure consists of two ideal diodes and a few resistors. The equivalent resistance of the circuit between $A$ and $B$ is

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