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The Laplacian of \( V = x^2 + y^2 + z^2 \) is

  • A.2
  • B.0
  • C.\( 2x + 2y + 2z \)
  • D.6

Answer: D

Each term differentiated twice with respect to its own variable gives two, and the three add to six. Since the result is not zero, this potential is a solution of Poisson's equation with a uniform charge density rather than of Laplace's equation.

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