A) 325 \[\Omega \]
B) 165\[\Omega \]
C) 198 \[\Omega \]
D) 225\[\Omega \]
E) 240 \[\Omega \]
Correct Answer: E
Solution :
Given\[{{R}_{o}}=500\,k\Omega ,\beta =49\]and\[P=5\times {{10}^{6}}\] we have \[P={{\beta }^{2}}\frac{{{R}_{o}}}{{{R}_{i}}}\] \[5\times {{10}^{6}}=\frac{{{(49)}^{2}}\times 500}{{{R}_{i}}}\] \[{{R}_{i}}=\frac{{{(49)}^{2}}\times 500}{5\times {{10}^{6}}}\] \[=240\,\Omega \]
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