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39. The proton is in uniform circular motion, with the electrical force of the sphere on the proton providing
the centripetal force. According to Newton’s second law,
F
=
mv
2
/r
,where
F
is the magnitude of the
force,
v
is the speed of the proton, and
r
is the radius of its orbit, essentially the same as the radius of
the sphere. The magnitude of the force on the proton is
F
=
eq/
4
πε
0
r
2
q
is the magnitude of
the charge on the sphere. Thus,
1
4
0
eq
r
2
=
mv
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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, Circular Motion, Force

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