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Help with this problem about electricity

  1. Oct 14, 2012 #1
    Can anybody help me with this problem?

    A spherical conductor of radius a is located at the center of a spherical conducting shell of inner radius b. The space between the inner conductor and and conducting shell is filled with an insulator of resistivity rho. A thin wire is passed through the outer conductor and insulator shells to the center conductor and voltage V is then applied between the inner conductor and the conducting shell. How much current is drawn from the voltage source?

    Integrate the power density (sigma E^2) over the insulator volume and compare the integral power to the power drawn from the voltage source (I V).
     
  2. jcsd
  3. Oct 14, 2012 #2
    nobody? =(
     
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