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Homework Help: Electric field inside a solid conducting sphere carrying charge q.

  1. Jan 29, 2012 #1
    1. The problem statement, all variables and given/known data
    A solid conducting sphere carrying charge q has radius a. What is the electric field when r<a.

    2. Relevant equations

    3. The attempt at a solution
    I found it using gauss law where Q=density*V. I ended up with qr/(4pi*a3o)

    HOWEVER, my friend told me it should be E=0 and we are unsure which one is the right answer. The method I used assumes that the charge is uniformly distributed throughout the volume of the sphere.

    Also, I believe that E=0 only when you have a hollow sphere with no charge inside. In this question, it is a SOLID sphere.
    Last edited: Jan 29, 2012
  2. jcsd
  3. Jan 29, 2012 #2


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    Staff Emeritus
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    What do you know about conductors?

    What do you know about like charges?
  4. Jan 29, 2012 #3
    thanks figured it out :)
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