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The current gain for a common emitter am...

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

Text Solution

Verified by Experts

The correct Answer is:
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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