Question

In the CB mode of a transistor when the collector voltage is changed by $0.5V$. The collector current changes by $0.05mA$. The output resistance will be

• A. $10k\Omega$
• B. $20k\Omega$
• C. $5k\Omega$
• D. $2.5k\Omega$

Answer 1

The correct option is A $10k\Omega$

Here $\Delta V_c=0.5V,\Delta i_c=0.05mA=0.05\times {10}^{-3}A$

Output resistance is given by

$R_{out}=\frac{\Delta V_c}{\Delta ic}=\frac{0.5}{0.05\times {10}^{-3}}={10}^4\Omega =10K\Omega .$