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  1. Dec 10, 2016 #1
    In case of wire(having uniform linear charge density), without assuming the wire infinite long, why we can't take electric field perpendicular to the curved part of the cylindrical Gaussian surface?
  2. jcsd
  3. Dec 10, 2016 #2


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    Hello hek, :welcome:

    There's also field lines going in the direction along the cylinder (except in the symmetry plane perpendicular to the axis).

    From very far away such a wire should look like a point charge and have the corresponding field. Only close by, the difference between infinitely long and just long is minimal.
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