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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

Options

  1. A4 Ω
  2. B13 Ω
  3. C4 Ω or 13 Ω
  4. D4 Ω or zero

Correct answer

C. 4 Ω or 13 Ω

Step-by-step solution

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.

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