AIPMT MAINS 2012 Physics Transistor Amplifiers MCQ Question
The input resistance of a silicon transistor is 100 Ω. Base current is changed by 40 μA which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4 kΩ. The voltage gain of the amplifier is:
2000
3000
4000
1000
Correct Answer
Detailed Explanation
The voltage gain (Av) of a common emitter amplifier is given by the formula Av = (Iout/Iin) × (Rout/Rin). Substituting the given values: Av = (2 × 10⁻³ / 40 × 10⁻⁶) × (4 × 10³ / 100) = 2000.
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