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Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

Determine the equivalent resistance between the points A and B for the network displayed in the figure.

Options

  1. A10 regardless of the values of V_A and V_B
  2. B5 if V_A > V_B and 10 if V_A < V_B
  3. C10 if V_A > V_B and 5 if V_A < V_B
  4. D5 regardless of the values of V_A and V_B

Correct answer

B. 5 if V_A > V_B and 10 if V_A < V_B

Step-by-step solution

The given circuit contains a diode in the upper branch. The diode's anode is connected towards terminal A and its cathode towards terminal B . If V_A > V_B , the diode is forward-biased and acts as a short circuit (ideal diode). The circuit consists of two 10 resistors connected in parallel. The equivalent resistance is R_ eq = 10 10 10 + 10 = 5 . If V_A The equivalent resistance is simply the resistance of the lower branch, which is R_ eq = 10 . Therefore, the equivalent resistance is 5 if V_A > V_B and 10 if V_A

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