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Due spheres

  1. Aug 25, 2012 #1
    We have a metal sphere of radius R in the space and resistivity p. At a distance d>R from it we have antoher sphere of metal of radius r<<R and charge q. The 2 spheres intially are at rest.
    What is the initial potential energy between them?
    Now the sphere accelerate and collide anelastically. What is the amount of heat Q after this process?

    P.S
    This is NOT an homework, but an entrance exame at the university.
    The question it's very intersting and i solved it.


    For me is [tex]\frac{1}{4 \pi ε} \frac{q^2}{d}[/tex]
    and this is for the proprieties of metals.
     
    Last edited: Aug 25, 2012
  2. jcsd
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