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Homework Help: Capacitance of concentric metal spheres

  1. Jan 25, 2010 #1
    1. The problem statement, all variables and given/known data

    A solid metal sphere has a radius of 10.0 cm and a concentric metal sphere has a radius 10.5 cm. The solid sphere has a charge 5.00 nC. (a) Estimate the energy stored in the electric field in the region between the sphere. Hint: you can treat the pheres essentially as parallel flat slabs separated by 0.5 cm. (b) Estimate the capacitance of the two-sphere system. (c) Estimate the total energy stored in the electric field from 1/2Q^2C.

    2. Relevant equations

    3. The attempt at a solution

    I stared with V=(KQ)/r but I'm pretty sure I am not right. My rationelle was to that I could treat the solid sphere as a point charge by Gauss's Law and find the potential difference between it's surface and the inside of the hollow shell. Doesn't seem right and I don't what to do about the "hint"...
    Last edited: Jan 25, 2010
  2. jcsd
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