The current gain of a transistor in a common base
arrangement in 0.98 . Find the change in collector current corresponding to a
change of 5.0 mA in emitter current . What would be the change in base current?

Options

A. 4.6 mA, 0.1 mA
B. 4.9 mA, 0.2 mA
C. 5.9 mA, 0.3 mA
D. 5.9 mA, 0.8 mA

Answer

A

Explanation

Given, `alpha=0.98 and DeltaI_(E)=5.0A`
From the definition of `alpha=(DeltaI_(C ))/(DeltaI_(E))`
Change in collector current,
`DeltaI_(C )=(alpha)(DeltaI_(E))=0.98xx5.0=4.9mA`
Change in base current,
`Delta I_(B)=DeltaI_(E)-DeltaI_(C )=(5.0-4.9)mA=0.1mA`