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96. A positive charge
q
is a distance
r – d
from
P
, another positive charge
q
is a distance
r
from
P
, and a negative charge –
q
is a distance
r + d
from
P
. Sum the individual electric
potentials created at
P
to find the total:
V
q
rd r rd
=
−
+−
+
L
N
M
O
Q
P
4
111
0
π
ε
.
We use the binomial theorem to approximate 1/(
r – d
) for
r
much larger than
d
:
11
112
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 Spring '10
 Rebello,NobelS
 Charge, Electric Potential

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