46
CHAPTER 16
(b)
(
)(
)
2
12
9
9
2
7
9
2
5.00
10
C
3.00
10
C
N m
8.99
10
3.85
10
J
C
0.350 m
e
i
q
r
−
−
−
×
−
×
⋅
=
×
= −
×
k q
PE
=
The negative sign means that
positive work must be done
to separate the charges
(that is, bring them up to a state of zero potential energy).
16.16
The potential at distance
from a charge
Q
is
0.300 m
r
=
9
9.00
10
C
−
= +
×
)
9
2
2
8.99
10 N m
C
9.00
10
0.300 m
e
k Q
V
r
−
×
⋅
×
=
=
9
C
270 V
= +
9
10
C
−
Thus, the work required to carry a charge
from infinity to this location
is
3.00
q
=
×
(
)
(
)
9
7
8.09
10
J
−
−
=
×
3.00
10
C
270 V
W
qV
=
=
×
+
(
)(
16.17
The Pythagorean theorem gives the distance from the midpoint of the base to the charge
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 Spring '09
 Physics, Pythagorean Theorem, Capacitance, Charge, Energy, Potential Energy, Work, 2 m, 1.00 cm, 0.350 M, 0.300 m, 0.010 0 m

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