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Question 31438
JEE Physics · Hard

Electrostatics: Conductor Properties MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Conductor PropertiesHardQuestion 31438

Question

Charge density on a conductor surface is greatest where:
  1. A
    Surface is flat
  2. B
    Curvature is smallest
  3. C
    Curvature is greatest (sharp points)
    Correct
  4. D
    Surface is horizontal

Correct answer

Curvature is greatest (sharp points)

Explanation

Field and surface charge density σ are highest at regions of greatest curvature (sharp points). Lightning rods use this — intense field at tip ionises air, providing discharge path.

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