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A triode whose mutual conductance is \mathrm{2.5 \mathrm{~m} \mathrm{~A} / volt} and anode resistance is 20 kilo ohm, is used as amplifier whose amplification is 10 . The resistance connected in plate circuit will be

Option: 1

1 \mathrm{k} \Omega


Option: 2

5 \mathrm{k} \Omega


Option: 3

10 \mathrm{k} \Omega


Option: 4

20 \mathrm{k} \Omega


Answers (1)

best_answer

\mathrm{\begin{aligned} & \mu=r_p \times g_m=20 \times 2.5=50 \\ & \text { From } A=\frac{\mu R_L}{r_p+R_L} \Rightarrow r_p+R_L=\frac{\mu R_L}{A}=\frac{50 R_L}{10}=5 R_L \\ & \Rightarrow 4 R_L=r_p \Rightarrow R_L=\frac{r_p}{4}=\frac{20}{4}=5 \mathrm{k} \Omega \end{aligned} }

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Deependra Verma

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