Question

The V-I characteristic of a diode is shown in the figure.
The ratio of forward to reverse bias resistance is:

• A. $10$
• B. $10^{-6}$
• C. $10^{6}$
• D. $100$

Answer 1

Answer: (B)

Forward bias resistance
$= \frac{\Delta V}{\Delta I} = \frac{0.1}{10\times10^{-3}} = 10\,\Omega$
Reverse bias resistance
$= \frac{10}{10^{-6}} = 10^{7}\,\Omega$
Ratio of resistances
$= \frac{\text{Forward bias resistance}}{\text{Reverse bias resistance}} = 10^{-6}$