Amateur Extra Class: 2020–2024
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E6A02:

Which of the following semiconductor materials contains excess free electrons?

  1. N-type
  2. P-type
  3. Bipolar
  4. Insulated gate
E6A01 E6A02 E6A03 E6A04 E6A05 E6A06 E6A07 E6A08 E6A09 E6A10 E6A11 E6A12