railway RRB JE (CBT I + CBT II) Mock Test 2024 Electronic Devices Bipolar Junction Transistor

What is the relation between α and β for a common emitter transistor?

1
\({\alpha } = {{\beta -1}\over \beta}\)
2
\({\alpha} = {{\beta \over {\beta +1}}}\)
3
\({\alpha} = {{\beta} \over {\beta - 1}}\)
4
\({\alpha } = {{\beta + 1}\over \beta}\)
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