Q90 / 90 · JEE Main 2022 (25 Jun Shift 2) · Physics

In an experiment of $C E$ configuration of $n - p - n$ transistor, the transfer characteristics are observed as given in figure.
If the input resistance is $200 Ω$ and output resistance is $60 Ω$ , the voltage gain in this experiment will be _____ .

Correct answer: 15

Solution

Voltage gain, $A_{V} = ?$
Input Resistance $= 200 Ω$
Output Resistance $= 60 Ω$

$β = \frac{Δ I_{C}}{Δ I_{B}} = \frac{(5 - 0) \times 10^{- 3}}{(100 - 0) \times 10^{- 6}} = 50$

$A_{V} = β \frac{R_{C}}{R_{B}} = 50 \times \frac{60}{200} = 15$

Hence, the correct answer is 15.