1. The problem statement, all variables and given/known data I just noticed that whenever I'm doing a problem involving Gauss Law, it always involves an infinite line/plate. I can't seem to figure out why it must be infinite large/long. Here is an explanation I read, but don't quite understand: http://physics.stackexchange.com/qu...nd-the-electric-field-of-a-finite-length-char 2. Relevant equations ∫E⋅A = Qenc/ε 3. The attempt at a solution I don't see why E becomes unpredictable and nonuniform on a finite line of charge. If the charge is still uniformly distributed, then the field should still be the same along the wire. Also, what causes the direction of E, to branch off into random directions rather than being radial like in an infinite line of charge? And, if the position of the Gaussian cylinder along the line of charge matters, why not just move it to the middle?