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Question

For a common emitter configuration, if α and β have their usual meanings the correct relationship between α and β is:

A
1α=1β+1
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B
α=β1β
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C
α=β1+β
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D
α=β21+β2
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Solution

The correct options are
A 1α=1β+1
C α=β1+β
We know, collector current is given as IC=βIB
Also, IC=αIE
Using, IE=IB+IC
ICα=ICβ+IC
Solving above equations,
1α=1+1β
α=β1+β

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