Question

The resistance of a germanium junction diode, whose $V-I$ characteristics is shown in the figure, will be $\left(v_{k} = 0.3 \, V\right).$

• A. $5 \, k\Omega $
• B. $0.2 \, k\Omega $
• C. $2.3 \, k\Omega $
• D. $\left(\frac{10}{2 .3}\right)k\Omega $

Answer 1

Answer: (B)

$R=\frac{\Delta V}{\Delta I}=\frac{2.3 - 0.3}{10 \times 10^{- 3}}$
$R=\frac{2}{10}\times 10^{3}$
$R=0.2\times 10^{3} \, \Omega$
$=0.2 \, k\Omega $