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The ``gas'' of electrons in the box push against the sides; they can
lower their kinetic energy and thus do work if the sides of the box
move outward as L expands. By considering the rate at which the
energy of the electron gas E decreases as the size of the box L
increases, compute
the force F exerted on the side of the box at x=L in terms of the
average density of electrons, 
.
Prof. Tomas Alberto Arias
Sat Apr 20 19:52:25 EDT 1996