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An engineer measures zero field everywhere on a closed surface. The correct conclusion is that

  • A.the surface must lie entirely within a conductor
  • B.the enclosed charge is zero
  • C.there is no charge anywhere in the vicinity
  • D.the enclosed charge is uniformly distributed

Answer: B

Correct answer: the enclosed charge is zero

Zero field everywhere on the surface gives zero flux, and zero flux means zero net enclosed charge. It does not mean there is no charge inside - equal positive and negative charges would satisfy it - and it says nothing about charge outside the surface.

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