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5
9. The distance from
Q
to
P
is 5
a
, and the distance from
q
to
P
is 3
a
. Therefore, the
magnitudes of the individual electric fields are, using Eq. 223 (writing 1/4
πε
0
=
k
),
G
G
E
kQ
a
E
kq
a
Qq
==
25
9
22
,.
We note that
G
E
q
is along the
y
axis (directed towards ±
y
in accordance with the sign of
q
),
and
G
E
Q
has
x
and
y
components,
with
G
G
EE
Qx
Q
=±
4
5
and
GG
Qy
Q
3
5
(signs
corresponding to the sign of
Q
). Consequently, we can write the addition of components
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 Fall '10
 Rebello,NobelS
 Electric Fields

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