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47. We use conservation of energy, taking the potential energy to be zero when the moving electron is far
away from the Fxed electrons. The Fnal potential energy is then
U
f
=2
e
2
/
4
πε
0
d
,where
d
is half the
distance between the Fxed electrons. The initial kinetic energy is
K
i
=
1
2
mv
2
,where
m
is the mass of an
electron and
v
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Unformatted text preview: is the initial speed of the moving electron. The Fnal kinetic energy is zero. Thus K i = U f or 1 2 mv 2 = 2 e 2 / 4 πε d . Hence v = s 4 e 2 4 πε dm = s (8 . 99 × 10 9 N · m 2 / C 2 )(4)(1 . 60 × 10 − 19 C) 2 (0 . 010 m)(9 . 11 × 10 − 31 kg) = 3 . 2 × 10 2 m / s ....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics, Conservation Of Energy, Energy, Potential Energy

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