10. We place the origin of our coordinate system at point
P
and orient our
y
axis in the
direction of the
q
4
= –12
q
charge (passing through the
q
3
= +3
q
charge). The
x
axis is
perpendicular to the
y
axis, and thus passes through the identical
q
1
=
q
2
= +5
q
charges.
The individual magnitudes 
, 
, 
,
G
G
G
E
E
E
1
2
3
and 

G
E
4
are figured from Eq. 223, where the
absolute value signs for
q
1
,
q
2
, and
q
3
are unnecessary since those charges are positive
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 Spring '09
 Bolton
 Cartesian Coordinate System, Charge, Complex number, Polar coordinate system, absolute value signs

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