Question

When a silicon p-n junction is in forward biased condition with a series resistance, it has a knee voltage of $\text{0.6} \, V$ . If $5 \, mA$ of current flows in it when the p-n junction is connected with a $\text{2.6} \, V$ battery, the value of the series resistance is

• A. $100 \, \Omega$
• B. $200 \, \Omega$
• C. $400 \, \Omega$
• D. $500 \, \Omega$

Answer 1

Answer: (C)

$R=\frac{(2.6-0.6)}{5 \times 10^{-3}}=400 \Omega$