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Homework 5 (due: March 29)
1.
What is the electric potential at the point P?
2.
What is the electric potential at the point P?
3.
The potential at the center of a 4.0-cm-diameter copper sphere is 500 V, relative to
V=0 V at infinity. How much excess charge is on the sphere?
4.
Find potential energy for two configurations (a) and (b) shown in Fig. Three particles
have the following charges
12
3
1,
5,
1
0
qC
q
C
μ
μμ
==
=
−
. Which configuration has
the lower energy?
+2 nC
P
-6 nC
5 cm
5 cm
+2 nC
45
0
45
0
+1 nC
P
+2 nC
1 cm
1 cm
1 cm
10 cm
2
q
10 cm
3
q
1
q
(b)
10 cm
10 cm
10 cm
3
q
1
q
2
q
(a)

5.
Point charge
11
qC
μ
=
is placed at the center of insulating uniformly charged sphere
of radius
1
R
m
=
and total charge
16
QC
= −
. Find electric potential at distance
r =
0.8 m
from the center of the sphere, assuming that electric potential is 0 very far from the
sphere.
6.
Point charge
q
is placed at the center of insulating uniformly charged sphere of radius
R=50 cm
and total charge

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