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14. (a) According to the graph, when
q
3
is very close to
q
1
(at which point we can
consider the force exerted by particle 1 on 3 to dominate) there is a (large) force in the
positive
x
direction.
This is a repulsive force, then, so we conclude
q
1
has the same sign
as
q
3
.
Thus,
q
3
is a positivevalued charge.
(b) Since the graph crosses zero and particle 3 is
between
the others,
q
1
must have the
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 Spring '08
 Any
 Physics, Force

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