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easyMCQAIEEE 20042026Physics
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When an npn transistor is used as an amplifier:

  1. A
    Electrons move from base to collector
  2. B
    Holes move from emitter to base
  3. C
    Electrons move from collector to base
  4. D
    Holes move from base to emitter

Solution & Step-by-step Explanation

In an npn transistor, the emitter is n-type, base is p-type, and collector is n-type.When used as an amplifier (active region), the emitter-base junction is forward biased and the base-collector junction is reverse biased.Electrons (majority carriers) from the emitter move into the base.Most of these electrons cross the thin base and are collected by the collector.Therefore, current flows due to electrons moving from the base toward the collector.

Practice this question

Try it yourself before checking the explanation above.

When an npn transistor is used as an amplifier:
A
Electrons move from base to collector
B
Holes move from emitter to base
C
Electrons move from collector to base
D
Holes move from base to emitter

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