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The Gaussian surface appropriate to a long straight line charge is

  • A.a coaxial cylinder
  • B.a sphere centred on the midpoint of the line
  • C.a cube with one face parallel to the line
  • D.a plane sheet parallel to the line at the point of interest

Answer: A

The field is radial and of constant magnitude at a given radius, so a coaxial cylinder makes the integral trivial and its flat ends contribute nothing because the field is tangential there. A sphere would suit only a point-symmetric source.

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