A) \[{{10}^{4}}\]
B) \[2\times {{10}^{4}}\]
C) \[5\times {{10}^{4}}\]
D) \[5\times {{10}^{3}}\]
Correct Answer: C
Solution :
\[{{r}_{i}}=\frac{\Delta {{V}_{i}}}{\Delta {{I}_{g}}}\,=\frac{0.02}{10\times {{10}^{-6}}}\,=2\times {{10}^{3}}\Omega \] Power gain \[={{\left( \frac{\Delta {{I}_{C}}}{\Delta {{I}_{g}}} \right)}^{2}}\,\frac{{{r}_{0}}}{{{r}_{i}}}\] \[=\left( \frac{{{10}^{3}}}{10\times {{10}^{-6}}} \right)\,\times \frac{10\times {{10}^{3}}}{2\times {{10}^{3}}}\,=5\times {{10}^{4}}\]
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