PHYSICS 211
Final EXAM FALL 200809
TIME: 120 minutes
January 27, 2009
DO NOT OPEN THIS EXAM BEFORE YOU ARE TOLD TO BEGIN
NAME________________________________________________
ID Number ________________________
Useful information
ε
0
=8.85x10
12
C
2
/N.m
2
.
μ
0
=4p x 10
7
Tm/A.
q
= 1.6
×
10

19
C
m
e
= 9.1x10
31
kg.
m
p
= 1.67×10
27
kg.
k
e
=8.9875x10
9
Nm
2
/C
2
The solution for the differential equation of the form
dy/dt
+
ay = b
is
y
=(
b/a)
(1exp(
at
))
Grading
A
B
TOTAL
Part A: Multiple choice questions (20) each question has 2 points
Score:________
Check if solution is continued on the back.
1
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If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = –80 nC, and q = 36 nC in the
figure, what is the magnitude of the total electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N
2.
A positive point charge q is placed off center inside an uncharged metal
sphere insulated from the ground as shown. Where is the induced charge
density greatest in magnitude and what is its sign?
a.
A; negative.
b.
A; positive.
c.
B; negative.
d.
B; positive.
e.
C; negative.
3
.
The electric potential inside a charged solid spherical conductor in equilibrium
a.
is always zero.
b.
is constant and equal to its value at the surface.
c.
decreases from its value at the surface to a value of zero at the center.
d.
increases from its value at the surface to a value at the center that is a
multiple of the potential at the surface.
e.
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 Spring '10
 DimitriPolyakov
 Physics, Magnetism, Magnetic Field, Electric charge, static magnetic field.

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