Q.

When npn transistor is used as an amplifier :

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a

Holes move from emitter to base

b

Electrons move from base to collector

c

Electrons move from collector to base

d

Holes move from base to emitter

answer is D.

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Detailed Solution

When forward bias is applied on npn-transistor, then it works as an amplifier. In forward biased npn-transistor, electron move from emitter to base and holes move from base to emitter.

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