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PHYSICS 222, FALL 2005
EXAM #1
SEPTEMBER 29, 2005
Name (printed): ____________________________________________
Ninedigit ID Number: ____________________________________________
Section Number: ____________________________________________
Recitation Instructor: ____________________________________________
INSTRUCTIONS:
i.
Put away all materials except for pens, pencils, erasers and your calculator.
Turn off your cell
phone if you have one.
ii.
Fill in your name, identification number, section number and recitation instructor above and on the
front of the multiple choice answer sheet using a number 2 pencil.
iii.
This exam contains 15 multiple choice problems worth 2 points each (problems 115), and 15
multiple choice problems worth 4 points each (problems 1630), for a total of 30 problems worth
90 course points.
iv.
In marking the multiple choice answer sheet use a number 2 pencil.
Do NOT use ink.
If you did
not bring a pencil, ask for one.
Fill in the appropriate circles completely.
If you need to change
any entry, you must completely erase your previous entry.
v.
Carefully read each problem completely and its five possible answers before beginning to work the
problem.
For each problem, select
one answer that is closest to the correct one.
vi.
Please turn over or cover your answer sheet when you are not marking it.
vii.
Before handing in your exam, copy down your answers on a piece of unused scratch paper for
comparison with the answer key to be posted later.
viii. When you are finished with the exam, please place all exam materials, including the answer sheet,
the exam itself and scratch paper, in your folder and return the folder to your recitation instructor.
GOOD LUCK!!
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View Full DocumentNote:
i
ˆ
,
j
ˆ
, and
k
ˆ
are unit vectors directed in the +x, +y, and +z directions, respectively, of a righthanded
Cartesian coordinate system.
Problems 115 are worth 2 points each.
1. At some instant of time, a negatively charged particle is moving with velocity
v
→
= v
i
ˆ
in a magnetic field
B
→
= B
k
ˆ
, where v is the particle's speed and B is the magnitude of
B
→
.
The direction of the magnetic
force on the particle is ____ .
A.
i
ˆ
B.
−
i
ˆ
C.
−
j
ˆ
D.
j
ˆ
E.
k
ˆ
2.
A currentcarrying circular coil with a magnetic moment
µ
→
is in a uniform magnetic field
B
→
.
The
maximum magnitude of the magnetic torque on the coil occurs when the angle between
µ
→
and
B
→
is ____
degrees.
A.
0
B.
45
C.
90
D.
135
E.
180
3. A sphere of radius R is in a uniform magnetic field of magnitude B.
The magnitude of the net magnetic
flux through the surface of the sphere is ____ .
A.
0
B.
π
R
2
B
C.
2
π
R
2
B
D.
4
π
R
2
B
E.
8
π
R
2
B
4.
Two long thin straight parallel wires each carry the same magnitude of current I but in opposite
directions.
The distance between the axes of the wires is d.
The magnitude of the (net) magnetic field at
a point midway between the two axes of the wires is ____.
A.
0
B.
2
µ
o
I
π
d
C.
µ
o
I
2
π
d
D.
µ
o
I
d
E.
µ
o
I
2d
5. The magnetic field at the center of a circular wire loop of radius R and carrying a current I ____
A. is zero.
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 Fall '05
 Ogilvie
 Physics

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