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The size and shape of the closed surface used in Gauss's law

  • A.determine the total flux, a larger surface giving more
  • B.must be chosen so that the enclosed charge lies at the centre
  • C.do not affect the total flux, only the ease of the calculation
  • D.must be spherical for the law to hold at all

Answer: C

The law holds for any closed surface whatever, which is what makes it so general. A surface chosen to match the symmetry of the problem lets the field be taken outside the integral, and that is the only reason for preferring one shape to another.

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