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Poisson's equation for the electrostatic potential reads

  • A.\( \nabla^2 V = -\rho_v/\epsilon \)
  • B.\( \nabla^2 V = \rho_v/\epsilon \)
  • C.\( \nabla^2 V = 0 \) wherever charge is present
  • D.\( \nabla V = -\rho_v/\epsilon \)

Answer: A

It follows from substituting the gradient relation into the differential form of Gauss's law, and the minus sign is inherited from the minus in the gradient relation. Solving it for a given charge distribution and set of boundary values determines the potential everywhere in the region.

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