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13. (a) Eq. 211 gives
()
( )
2
6
92
2
12
12
2
2
20.0 10 C
8.99 10 N m C
1.60N.
1.50m
qq
Fk
d
−
×
==
×
⋅
=
(b) On the right, a force diagram is shown as well as our choice of
y
axis (the dashed line).
The
y
axis is meant to bisect the line between
q
2
and
q
3
in order to
make use of the symmetry in the problem (equilateral triangle of
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Force

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