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A charge distributed along a thin wire is described by a

  • A.surface charge density in coulombs per square metre
  • B.volume charge density in coulombs per cubic metre
  • C.point charge
  • D.line charge density in coulombs per metre

Answer: D

Idealising the wire as having no thickness makes the charge per unit length the natural description, and integrating it along the wire gives the total charge. The field close to the wire diverges, which is a consequence of the idealisation rather than of physics.

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