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

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The current gain for a common emitter amplifier is 69. If the emitter current is 7 mA, the base current is
A. 0.1 mA
B. 1 mA
C. 0.2 mA
D. 2 mA
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Correct Answer - A
Current gain, `beta=I_C/I_B`
For common emitter configuration,
`I_E=I_C`
`therefore I_C=7` mA
`therefore I_B=I_C/beta=(7xx10^(-3)A)/69=`0.1 mA
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