A
=
1
⋅
10
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N
C
⋅
(
−
10
C
)
⋅
500
m
=
−
5
⋅
10
9
J
–
––––––––
–
–
––––––––
–
A
=
1
⋅
10
6
N
C
⋅
(
−
10
C
)
⋅
500
m
=
−
5
⋅
10
9
J
_
_
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