Physics 21
Fall, 2004
Practice Exam #1
1
2
3
4
5
Total
Name:
Recitation Section
Recitation Leader
Sept. 17, 2004
This exam is closed notes and closed book. You must show enough work on all problems to convince the grader you
understand how to solve the problem. You may use a calculator, but you must show a full solution to simultaneous
algebraic equations. An equation sheet is on the last page. There are five problems; each counts 20 points.
Problem 1.
3
Ω
2
Ω
4
Ω
13 V
4 V
8 V
I
1
I
3
I
2
a
b
(a) Write the loop and node equations needed to de
termine the currents
I
1
,
I
2
, and
I
3
in the circuit
shown.
(b) Determine the currents by explicit solution of the
equations.
(c) Determine the value of the potential difference be
tween point
a
and point
b
(
V
b
−
V
a
) in the above
circuit along the path through the 4 V battery
and the 2 Ω resistor.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Problem
2.
A line charge density of
λ
=
6
.
0
×
10
−
7
C/m extends along the
y
axis from
y
= 2
.
0 m
to
y
= 4
.
0 m, as shown.
y
x
(0,

2)
(0,4)
(0,y)
(5,0)
P
λ
(a) What is the vector (
r
−
r
) from a point (0
, y
)
on the line charge to a point
P
at (
x, y
)
=
(5
.
0
,
0
.
0) m?
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '07
 Hickman
 Physics, Mass, Work, 1%, 0k, 0 l, 2.0 m

Click to edit the document details