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9. At points between the charges, the individual electric fields are in the same direction
and do not cancel. Since charge
q
2
=
−
4.00
q
1
located at
x
2
= 70 cm has a greater
magnitude than
q
1
= 2.1
×
10
−
8
C located at
x
1
= 20 cm, a point of zero field must be closer
to
q
1
than to
q
2
. It must be to the left of
q
1
.
Let
x
be the coordinate of
P
, the point where the field vanishes. Then, the total electric
field at
P
is given by
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 Spring '09
 Bolton
 Charge, Electric Fields

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