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(A) In a common emitter transistor amplifier:$1$. The voltage gain $A_V$ is defined as the ratio of the output voltage to the input voltage.$A_V = \fr

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$\beta (R_L/r_i), \beta^2 (R_L/r_i)$

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(A) In a common emitter transistor amplifier:$1$. The voltage gain $A_V$ is defined as the ratio of the output voltage to the input voltage.$A_V = \frac{V_{out}}{V_{in}} = \frac{I_c R_L}{I_b r_i} = \beta \frac{R_L}{r_i}$, where $\beta = \frac{I_c}{I_b}$ is the a.c. current gain.$2$. The power gain $A_P$ is defined as the product of the current gain and the voltage gain.$A_P = \beta 	imes A_V = \beta 	imes (\beta \frac{R_L}{r_i}) = \beta^2 \frac{R_L}{r_i}$.Therefore, the voltage gain is $\beta (R_L/r_i)$ and the power gain is $\beta^2 (R_L/r_i)$.

In common emitter configuration of a transistor amplifier, $r_i$, $R_L$ and $\beta$ represent the input resistance, load resistance, and the a.c. current gain, respectively. The voltage gain $A_V$ and power gain $A_P$ are represented in magnitude by which of the following expressions?

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