1) For a common emitter configuration if α and β have their usual meaning the incorrect relationship between α and β is A) $\frac{1}{\alpha}=\frac{1}{\beta}+1$ B) $\alpha =\frac{\beta}{1-\beta}$ C) $\alpha =\frac{\beta}{1+\beta}$ D) $\alpha =\frac{\beta^{2}}{1+\beta^{2}}$ Answer: Option B,DExplanation:$I_{b}+I_{C}=I_{e}$ $\Rightarrow \frac{I_{b}}{I_{c}}+1=\frac{I_{e}}{I_{c}}$ $\Rightarrow \frac{1}{\beta}+1=\frac{1}{\alpha}\Rightarrow \frac{1}{\alpha}=\frac{1+\beta}{\beta}$ $\Rightarrow \frac{\beta}{1+\beta}$
