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NDA 2 2025 GAT, question 72

Topic: Physics

Q72

For a material under static conditions, which one among the following statements is correct ?

  1. (a) An insulator can be charged
  2. (b) A perfect conductor can be charged
  3. (c) Both perfect conductor and insulator can be chargedCorrect answer
  4. (d) Both perfect conductor and insulator cannot be charged

Solution.

Answer: (c) Both perfect conductor and insulator can be charged

  1. Both materials can acquire net charge.
  2. In a conductor free charges redistribute until electrostatic equilibrium is reached; in an insulator excess charges remain comparatively localised.
  3. Zero internal electric field in a conductor does not mean zero net charge.