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Uniformly Charged Circular Disk

  1. Oct 11, 2012 #1
    1. The problem statement, all variables and given/known data
    In what direction (using cylindrical coordinates) around a uniformly disk does the electric field NOT point?


    2. Relevant equations
    The directions could be r, θ, or z.


    3. The attempt at a solution
    I don't think it can point in the θ or the z direction-- either one would imply that there is a built-in preference to space for a certain direction, because symmetry arguments say that these two directions should be treated equally in all directions.

    I'm not sure though-- I'm assuming they mean around the edge of the disk on the outside, is this correct?
     
  2. jcsd
  3. Oct 12, 2012 #2

    SammyS

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    Hello cheungw. Welcome to PF !

    What if they don't mean around the edge of the disk ?

    What if they mean in the vicinity of the disk ?
     
  4. Oct 12, 2012 #3
    The problem says "around" the disk, so that probably means where does E not point outside of the disk.

    to answer, consider the electric field in regions far far away from the disk, so that the disk appears to be a point. What would the field look like?
     
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