In a transistor in $CE$ configuration, the ratio of power gain to voltage gain is
A$\alpha$
B$\beta / \alpha$
C$\beta \alpha$
D$\beta$
[J \& K CET 2005]
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D$\beta$
For CE configuration voltage gain $=\beta \times R_L / R_i$
Power gain $=\beta^2 \times R_L / R_i $
$\Rightarrow \frac{\text { Power gain }}{\text { Voltage gain }}=\beta$
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