Question

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

• A. 1:2
• B. 5:1
• C. 1:40
• D. 20:1

Answer 1

Answer: (B)

5:1

Answer 2

Dynamic resistance
=$$\frac{dV}{dl}
$⇒$ $r_1 = \frac{2.1 - 2 \, \text{k}\Omega}{10^{-5}}$
and $r_2 = \frac{4.2 - 4 \, \text{k}\Omega}{250 - 200}$
⇒ $$r1 :r2 = 5 : 1.
So,Correct option is (B)