In addition, there is the energy of interaction of the
two charges with the external electric field We find,
( )
(
)
1
1
2
2
7 C
2 C
0 09m
0 09m
q V
q V
A
A
µ
− µ
+
=
+
r
r
and the net electrostatic energy is
( )
(
)
1
2
1
1
2
2
0 12
7 C
2 C
0