For a common emitter configuration, if `alpha and beta` have their usual meanings, the incorrect relationship between `alpha and beta` is :

Options

A. `alpha=(beta^(1))/(1+beta^(2))`
B. `(1)/(alpha)=(1)/(beta)+1`
C. `alpha=(beta)/(1+beta)`
D. `alpha=(beta)/(1+beta)`

Answer

A, C

Explanation

`alpha=(I_(C))/(I_(e)),beta=(I_(C))/(I_(b))`
`I_(e)=I_(b)+I_(c)rArr(I_(e))/(I_(e))=(I_(b))/(I_(c))+1rArr(I)/(alpha)=(I)/(beta)+1`
`alpha = (beta)/(1+beta)`