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  4. The current gain for a common emitter amplifier is 69. If the emitter current is 7mA, the base current is:

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Q. The current gain for a common emitter amplifier is $69.$ If the emitter current is $7mA,$ the base current is:

NTA AbhyasNTA Abhyas 2022

Solution:

$\gamma =\frac{I_{E}}{I_{B}}=1+\beta =1+69=70$
Base current, $I_{B}=\frac{I_{E}}{\gamma }=\frac{7}{70}mA=0.1mA$