1
PHY108
Fall 2010
FINAL EXAM
December
14,
11:45 a.m.
–
2:45 p.m.
Circle your instructor’s name
:
Prof. Ia Iashvili
(
T,Th 12:301:45 pm)
Prof. Athos Petrou
(
M,W,F 2:002:50 pm)
PRINT YOUR NAME
LAST NAME
FIRST NAME
SIGN YOUR NAME
STUDENT ID NUMBER
Useful Constants
o
= 8.85
10
12
C
2
/N.m
2
k
= 8.99
10
9
N.m
2
.C
2
e
= 1.6
10
19
C
m
p
= 1.67
10
27
kg
m
n
= 1.67
10
27
kg
m
e
= 9.11
10
31
kg
N
A
= 6.02
10
23
atoms/mol
g
= 9.80 m/s
2
7
4
10
T m/A
o
INSTRUCTIONS
This is a closed book exam
There are four problems and six mini problems
Allow approximately 30 minutes for each problem (P) and 10 minutes for each mini
problem (MP)
You must show ALL work to receive full credit.
Numerical answers must have the right units, and if vectors proper directions
Use the back of the problem page if you need more space and mark OVER
on the
front of the page so that your work will be counted.
Place your answers in the answer boxes at the bottom of each problem page.
Problem Number
Maximum Score
Your Score
Grader
P1
25
P2
25
P3
25
P4
25
MP1
5
MP2
5
MP3
5
MP4
5
MP5
5
MP6
5
TOTAL
130
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2
P1.
An elastic circular conducting loop with resistance
2.00
R
is placed in a
uniform magnetic field
0.600
B
T as shown in the figure.
The area
A
of the loop
increases with time
t
according to the equation:
A
t
.
Constant
2
0.500 m
;
constant
2
0.700 m
/s
.
a.
(5)
Write an expression that gives the magnetic flux
B
through the loop as function
of time
t.
b.
(5)
calculate the induced voltage
on the loop
.
c.
(6)
Draw on the figure the direction of the induced current
i
in the loop. Explain.
d.
(4) Calculate the induced current
i
.
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 Fall '08
 RAMACHANDRAN
 Magnetic Field, Average Power, Alpha particle, uniform magnetic field, initial velocity vo

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