The i-V characteristic of a P-N junction diode is shown below. The approximate dynamic resistance of the P-N junction when a forward bias of 2 volt is applied

1 Ω

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0.25 Ω

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0.5 Ω C

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5 Ω

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Solution

The correct option is A $0.25 Ω$
The current at $2 V$ is $400 m A$ and at $2.1 V$ it is $800 m A$ . The dynamic resistance in this region

$R = \frac{Δ V}{Δ i} = \frac{(2.1 - 2)}{(800 - 400) \times 10^{- 3}} = \frac{1}{4} = 0.25 Ω$

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