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JEE Main · 2004 · 24 Apr 2004 · Offline · Semiconductors

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When npn transistor is used as amplifier
  1. (A)electrons move from base to collector✓ Correct
  2. (B)holes move from emitter to base
  3. (C)electrons move from collector to base
  4. (D)holes move from base to emitter

Answer: (A)

Solution

In an npn transistor the current is carried chiefly by electrons. They are injected by the n-type emitter, drift across the thin p-type base, and are gathered by the n-type collector, so the electrons move from the base into the collector.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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