JEE Main 2022 · 26 Jun · Shift 1 · Physics Q49

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PhysicsSingle correct+4 / -1Question 49 of 90

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 respectively, is :

Forward I-V curve of a diode, I (mA) against V (volt): marked points (2 V, 5 mA), (2.1 V, 10 mA), (4 V, 200 mA) and (4.2 V, 250 mA).

1 : 2

5 : 1

1 : 40

20 : 1

Answer and worked solution

Official answer: B

Dynamic resistance $\dfrac{\Delta V}{\Delta I}$ from the graph.

Near 2 V. $\dfrac{0.1}{5\times10^{-3}}=20\ \Omega$ . Near 4 V. $\dfrac{0.2}{50\times10^{-3}}=4\ \Omega$ .

Ratio $5:1$ .

(B)

Topics:Semiconductors and p-n junction

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JEE Main 2022 · 26 Jun · Shift 1, Physics question 49