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When an n–p–n transistor is used as an amplifier then

1. the electrons flow from emitter to collector
2. the holes flow from emitter to collector
3. the electrons flow from collector to emitter
4. the electrons flow from battery to emitter

Correct Option: A

In an n-p-n transistor, the charge carriers, are free electrons in the transistor as well as in external circuit; these electrons flow from emitter to collector.