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NDA 1 2024 GAT, question 133

Topic: Physics

Q133

Which one of the following is primarily responsible for conduction of current in a metal ?

  1. (a) Bound electrons
  2. (b) Free electronsCorrect answer
  3. (c) Both bound and free electrons
  4. (d) Ions

Solution.

Answer: (b) Free electrons

  1. Mobile conduction electrons drift through a metal under an electric field and carry the current.
  2. The positive ion lattice remains approximately fixed, and bound electrons are not the primary mobile carriers.