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71. 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
, where
q
is the magnitude of the charge on the sphere. Thus,
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 Spring '08
 Any
 Physics, Circular Motion, Force

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