A transistor is operated in common emitter configuration at constant collector voltage `V_(c)=1.5 V` such that a change in the base current from `100 muA` to `150 muA` produces a change in the collector current from `5 mA` to `10 mA`. The current gain `(beta)` is

Options

A. `67`
B. `75`
C. `100`
D. `50`

Answer

C

Explanation

`AC` current gain `beta` is defined as the ratio of the collector to the base current at constant collector voltage,
`beta=((Deltai_(c))/(Deltai_(B)))_(V_(c))`
Given, `Deltai_(C)=10 mA-5mA=5mA`
`Deltai_(B)=150 muA-100 muA=50 muA`
`:. beta=(5mA)/(50xx10^(-3)mA)=100`