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

Options

A. `75`
B. `100`
C. `150`
D. `50`

Answer

D

Explanation

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`