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If the plate resistance oftriode valve is $13 \times 10^6 \Omega$ and amplification factor is 21 . The mutual conductance will be
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Verified Answer
The correct answer is:
$1.6 \times 10^{-6} \mathrm{mho}$
For triode valve, amplification factor,
$$
\begin{aligned}
& \mu=r_p \times g_m \\
& \text { Here, } r_p=13 \times 10^6 \Omega, \mu=21, g_m=? \\
& \therefore \quad g_m=\frac{\mu}{r_p}=\frac{21}{13 \times 10^6}=1.6 \times 10^{-6} \mathrm{mho}
\end{aligned}
$$
$$
\begin{aligned}
& \mu=r_p \times g_m \\
& \text { Here, } r_p=13 \times 10^6 \Omega, \mu=21, g_m=? \\
& \therefore \quad g_m=\frac{\mu}{r_p}=\frac{21}{13 \times 10^6}=1.6 \times 10^{-6} \mathrm{mho}
\end{aligned}
$$
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