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Why dont integrate all electric fields in a sphere?

  1. Dec 13, 2011 #1
    If volumetric charge distribution has spherical symmetry
    I want to find the trapped charge a in certain radius
    Why did not need to do an integral from 0 to R to all the electric fields inside the sphere but take only the external field(how gauss law says)?

    The Electric fiels is: E=3AB*r*e^(-1.5Br^2)
  2. jcsd
  3. Dec 13, 2011 #2

    Simon Bridge

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    You could do that, it's just that the result for the field inside the radius is zero.
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