The electric potential energy of a uniform sphere of charge q and radius r is given by

(a) Does the energy represent a tendency for the sphere to bind together or blow apart? The nuclide 239Pu is spherical with radius 6.64 fm. For this nuclide, what are?

(b) The electric potential energy U according to the equation,

(c) The electric potential energy per proton, and

(d) The electric potential energy per nucleon? The binding energy per nucleon is 7.56 MeV.

(e) Why is the nuclides bound so well when the answers to (c) and (d) are large and positive?

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3q 20 meor