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

• A

  $100\mathrm{ }\mathrm{\Omega }$
• B

  $200\mathrm{ }\mathrm{\Omega }$
• Correct answer
  C

  $400\mathrm{ }\mathrm{\Omega }$
• D

  $500\mathrm{ }\mathrm{\Omega }$

Solution

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

Hence, the correct answer is option: 'C'.