28. (a) The potential difference across
C
1
(the same as across
C
2
) is given by
(
)(
)
3
1
2
1
2
3
15.0
F
100V
50.0V.
10.0
F+5.00
F+15.0
F
C V
V
V
C
C
C
µ
µ
µ
µ
=
=
=
=
+
+
Also,
V
3
=
V – V
1
=
V – V
2
= 100 V – 50.0 V = 50.0 V. Thus,
(
)(
)
(
)(
)
4
1
1
1
4
2
2
2
4
4
4
3
1
2
10.0
F
50.0V
5.00 10
C
5.00
F
50.0V
2.50 10
C
5.00 10
C
2.50 10
C=7.50 10
C.
q
CV
q
C V
q
q
q
µ
µ
−
−
−
−
−
=
=
=
×
=
=
=
×
=
+
=
×
+
×
×
(b) The potential difference
V
3
was found in the course of solving for the charges in part
(a). Its value is
V
3
= 50.0 V.
(c) The energy stored in
C
3
is
(
)(
)
2
2
2
3
3
3
1
1
15.0
F
50.0V
1.88 10
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- Spring '10
- Rebello,NobelS
- Potential difference
-
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