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The I - V characteristics of a p - n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of 2 V and 4 V respective is

Options

  1. A1 : 2
  2. B5 : 1
  3. C1 : 40
  4. D20 : 1

Correct answer

B. 5 : 1

Step-by-step solution

Dynamic resistance of a diode is defined as, R = ∆ V ∆ i . At forward bias voltage of 2   V , R 1 = ∆ V ∆ i = 2 . 1 - 2 10 - 5 × 10 - 3 = 20   Ω At forward bias voltage of 4   V , R 2 = ∆ V ∆ i = 4 . 2 - 4 250 - 200 × 10 - 3 = 4   Ω . Therefore, R 1 R 2 = 20 4 = 5 1

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