Question

The ratio of forward bias to reverse bias resistance of $p-n$ junction diode is :

• A. ${10}^{-1}:1$
• B. ${10}^{-2}:1$
• C. ${10}^{-3}:1$
• D. ${10}^{-4}:1$

Answer 1

The correct option is D ${10}^{-4}:1$

Approximate resistance of $p-n$ junction in forward bias, $R_f={10}^2\Omega$

Approximate resistance of $p-n$ junction in reverse bias, $R_r={10}^6\Omega$

$\therefore \frac{R_f}{R_r}=\frac{{10}^2}{{10}^6}=\frac{{10}^{-4}}{1}$

$\Rightarrow R_f:R_r={10}^{-4}:1$