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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 2V and 4V respectively, is:

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5:1

$1 : 2$

20:1

1:40

answer is B.

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Detailed Solution

Using, $R = \frac{Δ V}{Δ i}$

$\frac{R_{1}}{R_{2}} = \frac{Δ v_{1}}{Δ i_{1}} \frac{Δ i_{2}}{Δ v_{2}} = \frac{0.1}{5} \times \frac{50}{0.2} = 5$

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