Uniformly charged disk charge

  1. A uniformly charged disk has a radius of 2.6 cm and carries a total charge of 3.6*10^-6C.

    Find the electric field on the x-axis at a distance of 3.3mm away/

    I really don't understand what I put for sigma.

    this is what I have so far:

    (sigma/2(8.85*10^.12))(1-( 1/ sqrt( ( .026m^2/0.0033^2)-1))

    Sigma is the total charge/the area...

    so sigma= (3.6*10^-6)/(2pi(.026)^2)=8.48*10^-4

    I feel like I have some part of this wrong.
  2. jcsd
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