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  • A change of in the anode current of a triode occurs when the anode potential is chang

A change of \mathrm{0.8\ mA} in the anode current of a triode occurs when the anode potential is changed by \mathrm{10\ V.\ If\ \mu = 8} for the triode, then what change in the grid voltage would be required to produce a change of \mathrm{4\ mA} in the anode current.

Option: 1

\mathrm{6.25\ V}


Option: 2

\mathrm{0.16\ V}


Option: 3

\mathrm{15.2\ V}


Option: 4

None of these


Answers (1)

best_answer

The first data gives value of plate resistance
\begin{aligned} &\mathrm{ r_p=\frac{\Delta V_p}{\Delta i_p}=\frac{10}{0.8 \times 10^{-3}}=\frac{10^5}{8} \Omega} \\ &\mathrm{ \text { Also } g_m=\frac{\Delta i_p}{\Delta V_g} \text { and } g_m=\frac{\mu}{r_p}} \\ &\mathrm{ \Rightarrow \Delta V_g=\frac{\Delta i_p \times r_p}{\mu}=\frac{4 \times 10^{-3} \times 10^5 / 8}{8}=6.25 \mathrm{~V}} \end{aligned}

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