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JAMB Physics 2001 Question 34

Question 34

Electrostatics

The ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is

  1. A.e/(4πεoGm)
  2. B.e2/(Gm2)
  3. C.Gm2/(4πεoe2)
  4. D.e2/(4πεoGm2)
Show the answer and explanation

Answer: D (e2/(4πεoGm2))

Explanation

FE = e2/(4πεod2) and FG = Gm2/d2. Dividing, d2 cancels: FE/FG = e2/(4πεoGm2).