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The absolute potential at a point is conventionally referred to

  • A.the surface of the earth, which is at a potential of one volt
  • B.infinity, where the potential is taken as zero
  • C.the nearest conductor, whose potential is taken as zero
  • D.the position of the source charge itself

Answer: B

Correct answer: infinity, where the potential is taken as zero

Only differences in potential have physical meaning, so a reference must be chosen. Infinity is the natural choice for an isolated charge distribution, since the field vanishes there. In circuit work the earth or a chassis is used instead, and the choice is a convention rather than a fact about nature.

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