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