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For a common emiter configuration if a a...

For a common emiter configuration if `a` and `beta` have their usualy meaning , the incorrrect relationship between `a and beta` is :

A

`a = (beta)/(1 + beta)`

B

`a = (beta^(2))/(1 + beta^(2))`

C

`(1)/(a) = (1)/(beta) + 1`

D

`a = (beta)/(1 - beta)`

Text Solution

Verified by Experts

The correct Answer is:
B, D
We know that ` a= (I_(c))/(I_(e)) and beta = (I_(c))/(I_(e)) `
Also `I_(e) = I_(b) + I_(c)`
`:.a = (Ic)/(I_(b) + I_(c)) = ((I_(c))/(I_b))/(1+ (I_(c))/(I_b)) = (beta )/(1 + beta)`
Option (b) and (d) are therefore correct
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