1
PHY108
Fall 2011
EXAM 3
November
12,
8:00
–
10:00 a.m.
Circle your instructor’s name
:
Prof. Avto Kharchilava
(
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
= 1.60
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
INSTRUCTIONS
This is a closed book exam except that you are allowed one 8.5”x11” sheet
with
equations on it and nothing else.
There are 4 problems
–
you must attempt them all.
Allow approximately 20 minutes for each problem.
You must show ALL your work to receive full credit.
Numerical answers must have SI units and the appropriate number of
significant figures.
Use the back of the problem page if you need more space and mark OVER on
the front side to indicate that there is material at the back side.
Enter your answers in the box at the bottom of each page.
PROBLEM
NUMBER
MAXIMUM
SCORE
YOUR SCORE
GRADER
1
25
2
25
3
25
4
25
TOTAL
100
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2
P1.
Consider the circuit shown in the figure.
a.
(4 ) Apply Kirchhoff’s loop
rule (KLR) to loop (abefa)
b.
(4)
Apply Kirchhoff’s loop rule (KLR) to loop (bcdeb)
c.
(3)
Apply Kirchhoff’s junction rule (KJR)
to point b.
The values of the circuit parameters are as follows:
R
1
= 1.0
,
R
2
= 2.0
,
1
= 1.5 V,
2
= 2.0 V.
Determine the
d.
(6)
Determine the currents
1
2
3
,
, and
i
i
i
e.
(4)
The power
1
P
that emf
1
delivers to the circuit.
f.
(4) The potential difference
d
b
V
V
between points d and b.
3
1
1
2
2
2
3
1
1
2
3
3
2
3
1
2
3
a.
KLR
abefa
:
0
(eqs.1)
b.
KLR
bcdef
:
0
(eqs.2)
c.
KJR:(b):
(eqs.3)
d:
1.5
0
(eqs.1)
2
2
0
(eqs.2)
(eqs.3)
From e
i R
i R
i R
i
i
i
i
R
i
i
i
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 Fall '08
 IASHVILI
 Magnetic Field, magnetic field region, Apply Kirchhoff

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