Energy of Configuration

  1. A sphere of radius R carries a charge density kr(where k is a constant!).What will be the energy of the Configuration??
  2. jcsd
  3. Meir Achuz

    Meir Achuz 2,076
    Science Advisor
    Homework Helper
    Gold Member

    1. Find the potential phi(r) inside the sphere.
    2. Integrate rho*phi/2 over the volume of the sphere.
    3. The algebra is a bit complicated. I get 35pi^2k^2R^7/72, but check me for errors.
  4. Gentleman,Why won't will be find the Potential outside the sphere..
    I am very much perplexed with this Energy term..This is interaction energy
    Pls help logically,i can do the maths involved.!!
    Pls explain the origin of energy and i think we will integrate over whole space...but i don't have clear idea.!

  5. Well i got the solution as 4pi*k^2*R^7/21*epsilon!!
    I don't know whether you are correct or me!
  6. mukundpa

    mukundpa 514
    Homework Helper

    The energy is due to the work done in configuring the sphere. Consider the sphere of radius r, and add a layer of thickness dr. Calculate the work dw is required to put this layer of charge. Integrate the work dw over the radius 0 to R. This will be the energy of the configuration
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