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Electric Field and Electric Potential

  1. Feb 24, 2008 #1
    [SOLVED] Electric Field and Electric Potential

    1. Refer to a sphere of radius R that has a positive charge Q uniformly distributed on its surface.

    Which of the fllowing represents the magnitude of the electric field E and the potential V as functions of r, the distance from the center of the sphere, where r < R?

    A) E = 0 and V = kQ/R
    B) E = 0 and V = kQ/r
    C) E = 0 and V = 0
    D) E = kQ/(r^2) and V = 0
    E) E = kQ/(R^2) and V = 0


    Which of the following represents the magnitude of the electirc field E and the potential V as functions of r, the distance from the center of the sphere, where r > R?

    A) E = kQ/(R^2) and V = kQ/R
    B) E = kQ/R and V = kQ/R
    C) E = kQ/R and V = kQ/r
    D) E = kQ/(r^2) and V = kQ/r
    E) E = kQ/(r^2) and V = kQ/(r^2)


    2. E = kq/(r^2) and V = kq/r


    3. Thinking it through, I got the answers B and D, respectively.

    Thanks in advance!!
     
  2. jcsd
  3. Feb 26, 2008 #2
    nm i got it.
     
  4. Apr 9, 2009 #3
    Re: [SOLVED] Electric Field and Electric Potential

    Is the answer actually B and D?

    I'm thinking it might be C and D. Potential is the integration of the electric field dotted with dr. If E is zero, how can there be any potential? Am I wrong?
     
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