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

Consider the current–voltage characteristics for the devices shown in the figure between the terminals A and B . Assuming ideal diodes, determine the equivalent resistance of the left device and the right device respectively, when V_A

Options

  1. Aand 10
  2. B10 and 10
  3. C10 and 20
  4. Dand 20

Correct answer

D. and 20

Step-by-step solution

Given V_A For the left circuit: The diode is connected with its p-side towards A and n-side towards B. Since V_A Thus, the equivalent resistance of the left device is . For the right circuit: The upper branch has a diode with its p-side towards A and n-side towards B. Since V_A The lower branch has a diode with its n-side towards A and p-side towards B. Since V_B > V_A , it is forward-biased and acts as a short circuit (ideal diode). The equivalent resistance of the right device is determined solely by the lower br

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