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The current gain for transistor working...

The current gain for transistor working as a common base amplifier is 0.96.If the emitter current is 7.2mA, then the base current is

A

0.29

B

0.35 mA

C

0.39 mA

D

0.43 mA

Text Solution

Verified by Experts

The correct Answer is:
A
`alpha=0.96, I_(E)=7.2 mA`
`alpha=(I_(C ))/(I_(E )) or I_(C)= alphaI_(I)`
`I_(C) =0.96xx7.2=6.91mA,I_(E)=I_(C)+I_(B)`
`I_(B)=I_(C )=7.2-6.91=0.29mA`
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Knowledge Check

  • The current gain for a transistor working as a common-base amplifier is 0.96 . If the emitter current is 7.2 mA , the base current will be

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