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A transistor is operated in common emitt...

A transistor is operated in common emitter configuration at `V_(c)=2 V` such that a change in the base current from `100 muA` to `200 muA` produces a change in the collector current from `5 mA` to `10 mA`. The current gain is

A

`75`

B

`100`

C

`150`

D

`50`

Text Solution

Verified by Experts

The correct Answer is:
D
For a transistor `I_(E)=I_(B)+I_(C)`
where `I_(E)`=emitter current
`I_(B)`=base current
`I_(C)`=collector current
and current gain `beta =(DeltaI_(C))/(DeltaI_(B))`
`DeltaI_(C)=5xx10^(-3)A`
`DeltaI_(B)=100xx10^(-6)A`
`beta=5/100xx1000=50`
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Knowledge Check

  • A transistor is operated in common emitter configuration at V_(c)=2 V such that a change in the base current from 100 muA to 300 muA produces a change in the collector current from 10 mA to 20 mA . The current gain is

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    D
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