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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 96 of 200

Q96
General SciencePhysics
An n-type semiconductor is
  1. a.negatively charged.
  2. b.positively charged.
  3. c.neutral.
  4. d.negatively or positively charged depending upon the amount and substance of impurity.

Answer: (C) neutral.

In an n-type semiconductor each free electron from a donor atom leaves behind a positively charged donor ion, so the crystal as a whole stays electrically neutral. Having electrons as majority carriers does not make it negatively charged.

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