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When n-p-n transistor is used as an amplifier, then (a) holes moves from emitter (b) electrons move from base to collector

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When n-p-n transistor is used as an amplifier, then 

(a) holes moves from emitter 

(b) electrons move from base to collector

(c) holes move from base to emitter 

(d) electrons move from collector to base.

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(b) electrons move from base to collector

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