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NDA 1 2024 GAT, question 54

Topic: Physics

Q54

Which one of the following is the best shape of a solid metal rod to form the top end of a lightning conductor ?

  1. (a) Option (a)Correct answer
  2. (b) Option (b)
  3. (c) Option (c)
  4. (d) Option (d)

Solution.

Answer: (a) Option (a)

  1. A pointed metal tip produces a strong electric field near its sharp end, which lets charge leak away and draws the strike safely to the rod.
  2. Of the drawings, (a) is the pointed rod, so it is the best shape.