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In an amplifier the load resistance $R_L$ is equal to the plate resistance $\left(r_p\right)$. The voltage amplification is equal to
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$\mu / 2$
Voltage gain $A_v=\frac{\mu}{1+\frac{r_p}{R_L}}$, for $r_p=R_L \Rightarrow A_v=\frac{\mu}{2}$
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