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The potential at a distance \( r \) from a point charge \( Q \) is

  • A.\( Q/(2\pi\epsilon_0 r) \)
  • B.\( Qr/(4\pi\epsilon_0) \)
  • C.\( Q/(4\pi\epsilon_0 r) \)
  • D.\( Q/(4\pi\epsilon_0 r^2) \)

Answer: C

Integrating the inverse square field inward from infinity yields an inverse first power potential. The distinction between the two powers is worth fixing firmly, since confusing them is the commonest error in electrostatics.

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