The value of current gain `alpha` of trasistor is `0.98`. The value of `beta` will be

Options

A. `4.9`
B. `490`
C. `59`
D. `49`

Answer

A

Explanation

Current gains are given by
`alpha=(Deltai_(C))/(Deltai_(E))` and `beta=(Deltai_(C))/(Deltai_(B))`
Where `Deltai_(C),Deltai_(E),Deltai_(B)` are change in collector current emitter current and base current respectively. The relation between `alpha` and `beta` is
`beta=(alpha)/(1-alpha)`
Given, `beta=0.98`, hence we have
`beta=0.98/(1-0.98)=49`