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JEE Main 2017 · 9 Apr · Shift 1, Physics question 27

The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is :

Choose one option
Answer and worked solution

Official answer: B

α=β1+β=6970\alpha=\dfrac\beta{1+\beta}=\dfrac{69}{70}, so IC=6970×7.0=6.9I_C=\dfrac{69}{70}\times7.0=6.9 mA.

Topics:Transistors
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