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Wave Optics

Question
CBSEENPH12039836
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The Input resistance of silicon transistor 100Ω. Base current is changed by 40 uA which results in a change in collector current by 2 mA. This transistor is used as common-emitter amplifier with a load resistance of 4 kΩ. The voltage gain of the amplifier is

  • 2000

  • 3000

  • 4000

  • 1000

Solution

A.

2000

We know
straight V subscript straight g space equals space straight beta straight R subscript straight L over straight R subscript straight i space equals space fraction numerator increment straight l subscript straight C over denominator increment straight l subscript straight B end fraction straight R subscript straight L over straight R subscript straight i space space space space space open parentheses therefore space straight beta space equals fraction numerator increment straight l subscript straight C over denominator increment straight l subscript straight B end fraction space close parentheses on space putting space given space values straight V subscript straight g space equals space fraction numerator 2 space straight x space 10 to the power of negative 3 end exponent over denominator 40 space straight x space 10 to the power of negative 6 end exponent end fraction space straight x space fraction numerator 4 space straight x space 10 cubed over denominator 100 end fraction straight V subscript straight g space equals space 2000

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