The stability factor (S) for common emitter circuit is given by _______ (treating base current constant)

Stability factor :

It is the measure of the stability of operating point in a transistor circuit.

S = \(\frac{\partial I_{C}}{\partial I_{CO}}\)= \(\frac{1+\beta}{1-\beta(\frac{\partial I_{B}}{\partial I_{C}})}\)

Calculation :

Given :

I_B = Constant

\(\frac{\partial I_{B}}{\partial I_{C}}\) = 0

S = 1 + \(\beta\)

Hence correct option is "2"