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Q.

When a common emitter transistor is acting as an amplifier,

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a

emitter - base junction is reverse biased and collector - emitter junction is forward biased.

b

current amplification is αRcRi

c

power amplification is β(RcRi)2

d

emitter - base junction is forward biased and collector emitter junction is reverse biased.

answer is D.

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Detailed Solution

When a common - emitter transistor is used as an amplifier, emitter - base junction is forward biased and collector - emitter junction is reverse biased.
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When a common emitter transistor is acting as an amplifier,