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The potential of an infinite line charge

  • A.cannot be referred to infinity
  • B.is the same as that of a point charge of the same total charge
  • C.falls as the inverse square of the distance from the line
  • D.is zero everywhere

Answer: A

Integrating the inverse first power field gives a logarithm, which diverges at infinity, so a reference at some finite radius must be chosen instead. The potential difference between two radii remains perfectly well defined.

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