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# For a common emitter configuration

Question:

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

1. $\alpha=\frac{\beta^{2}}{1+\beta^{2}}$

2. $\frac{1}{\alpha}=\frac{1}{\beta}+1$

3. $\alpha=\frac{\beta}{1-\beta}$

4. $\alpha=\frac{\beta}{1+\beta}$

Correct Option: , 4

Solution: