2016
JEE Mains
MSQ
JEE Main 2016 (Offline)
For a common emitter configuration, if $\alpha $ and $\beta $ have their usual meanings, the incorrect relationship between $\alpha $ and $\beta $ is :
A.
$\alpha = {\beta \over {1 + \beta }}$
B.
$\alpha = {{{\beta ^2}} \over {1 + {\beta ^2}}}$
C.
${1 \over \alpha } = {1 \over \beta } + 1$
D.
$\alpha = {\beta \over {1 - {\beta ^2}}}$