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Electric Forces and Electric Fields
31
(b) Any point on the
x
-axis in the range
0
x
<
is located closer to the larger magnitude
charge
( )
5.00 C
q
µ
=
than the smaller magnitude charge
( )
4.00 C
q
=
. Thus, the
contribution to the resultant electric field by the larger charge will always have a
greater magnitude than the contribution made by the smaller charge. It is not
possible for these contributions to cancel to give a zero resultant field.
(c) If a point is on the
x
-axis in the region
, the contributions made by the
two charges are in opposite directions. Also, a point in this region is closer to the
smaller magnitude charge than it is to the larger charge. Thus, there is a location in
this region where the contributions of these charges to the total field will have equal
magnitudes and cancel each other.
1.00 m

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