Name: _ Class: _ Date: _
ID: A
w9final
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. If C = 36 F, determine the equivalent capacitance for the combination shown.
_
a. 24 F b. 28 F c. 36 F

scangrade v. 1.2
graded on Sat
key A
key B
key C
key D
Tform
B
A
D
B
B
C
A
D
A
D
D
A
B
D
D
C
B
A
B
D
B
C
C
D
B
B
A
D
C
D
Qcode
102
104
105
109
112
114
115
117
120
124
125
127
128
129
130
131
132
134
135
138
139
140
141
143
144
146
150
152
154
155
Order Ra

Quiz 3 solutions
May 10, 2012
1. In a cathod ray tube, the electron beam current is 30. micro-A. How many electrons hit
the tube screen every 40. s?
7.5e15
The total charge is:
Q = I t = 30 106 A 40s = 1.2 103 C.
So the number of electrons is:
1.2 103 C
Q

Quiz 4, Version 2: Physics 1B Spring 2012, Dr. Michelsen. You may not bring in anything written. You
will be given these formulas on the quiz:
You may find some of the following formulas and information useful:
G 6.67 1011 N-m 2 kg 2
g 9.8 m/s 2
ke 8.99 1

Quiz 4 solutions
May 28, 2012
1. The current in a 20 ohm resistor increases linearly from 3.0 A to 5.0 A in 3.0 s. How
much charge ows through the resistor in that time, in C?
12
First we can get the expression of current I as a function of time t:
2
I (t

scangrade
graded on
v. 1.2
Sun
key A
key B
key C
key D
Tform Qcode Order Raw Score % Score
A
102
164
4
40
C
105
108
7
70
C
109
97
2
20
A
112
113
8
80
C
114
111
1
10
D
115
4
5
50
C
117
154
5
50
A
120
131
3
30
A
124
73
8
80
C
125
13
7
70
A
128
49
7
70
A
129

Physics 1B
Quiz 5 6/8/2012
Directions: Use pencil only. On your Scantron, you should have already blackened in your Student ID,
using 1 for A, 7 for U, making a 9-digit number (for shame if you havent). Fill in x in the Test
Form box. Choose the one best

Quiz 5 solutions
June 11, 2012
1. A circular loop of wire is 0.20 m in radius. A magnetic eld is 0.080 T everywhere
inside the loop. It passes perpendicularly through the loop, and is increasing at a rate of
0.010 T/s. What is the induced EMF, in V?
1.3e-

19.13(a) To calculate the electric eld at postion r due to charge q we use (19.5) on page
612:
E = ke
q
r
r2
(1)
Here q should include the sign, and r points from the position of q to the position where
you want to calculate the electric eld. Please read

20.48 The electrostatic energy stored in the electrostatic eld of a charged capacitor is:
U=
Q2
1
1
= QV = C (V )2 .
2C
2
2
Here we know U and C, so we use the last equation and get:
V =
2U
=
C
2 300J
= 4472.1V
30 106 F
20.50(a)
Q = C V = 150 1012 F 10.0

21.1 The charge is
Q = I t = 30 106 A 40s = 1.2 103 C.
So the number of electrons is:
Q
1.2 103 C
=
= 7.5 1015 .
e
1.6 1019 C
21.5 From the periodic table of the elements, we can nd the molar mass of aluminum is
27g/mol, which means the mass of one mole a

22.33 Here we need to use the result of example 22.6(Page 744).
(a)According to the problem, both of the coils carry the same current. If the currents are
antiparallel, then the magnetic eld generated by the two coils have the same magnitude
and opposite

Physics 1B: Electricity & Magnetism, Spring 2015
Some practice problems for the nal exam, Ch. 1923
(last update: 5/31)
There will be several questions on the nal exam that will be very similar to those listed here (particularly
for Ch. 23 material). Not a

Physics 1B: Electricity & Magnetism, Spring 2015
Some practice problems for the nal exam, Ch. 1922
(last update: 5/29)
There will be several questions on the nal exam that will be very similar to those listed here (particularly
for Ch. 23 material). Not a

Physics 1B: Electricity & Magnetism, Spring 2015
Final Exam, June 12, 2015
Useful coefcients:
g = 9.8 m s2
Avagadros Number: 6.02 1023
Mass of proton, mp = 1.67 1027 kg; Mass of electron, me = 9.11 1031 kg
Unit of elementary charge e = 1.6 1019 C
Coulombs

At each of the specied points, calculate the magnitude of B, and draw arrows denoting the direction & magnitude of the magnetic eld
A distance r from a long straight wire:
1 cm
I=20A
2 cm
2 cm
1c
2 cm
m
1c
2c
2 cm
1 cm
I=5A
I=20A, into page:
I=5A
m
1

80
Quiz 4
40
0
20
N
60
=6.46 =1.87
0
5
Raw Score (Max.=10)
10
Figure 1: Results for quiz 4: Mean = 6.46/10; standard deviation = 1.87
Physics 1B: Electricity & Magnetism, Spring 2015
Quiz #4, May 27, 2015
This is version A!
Useful coefcients:
g = 9.8 m s2

Quiz 3, Version 3: Physics 1B Spring 2012, Dr. Michelsen. You may not bring in anything written. You
will be given these formulas on Quiz 3:
G 6.67 1011 N-m 2 kg 2
g 9.8 m/s 2
ke 8.99 109 N-m 2 C2
proton charge 1.6 1019 C
surface area of a sphere 4 r 2
4

Quiz 2 solutions
April 25, 2012
1. (See gure 1.) Consider a solution of sodium hydroxide (NaOH). We model an OHradical as an oxygen with -2 electrons charge, connected to a hydrogen with +1 proton
charge. A dissociated sodium ion, Na+, the O(-2), and H+ a

scangrade v. 1.1
graded on Tue
key A
key B
key C
key D
Tform
B
D
C
C
C
A
A
C
B
D
D
A
D
C
C
C
D
B
B
D
D
B
A
C
A
A
D
Qcode
102
104
105
109
112
114
115
117
120
124
125
127
128
129
130
131
132
134
135
138
139
140
141
143
144
152
154
Order Raw Score % Score
68

Name: _ Class: _ Date: _
ID: C
w10q1
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. A spherical volume of space has an electric field of intensity 100 N/C directed radially outward from it

Name: _ Class: _ Date: _
ID: A
quiz2
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. If an electron is accelerated from rest through a potential difference of 1 200 V, find its approximate

Name: _ Class: _ Date: _
ID: B
quiz3-1bw10
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. A nichrome wire has a radius of 0.50 mm and a resistivity of 1.5 106 m. If the wire carries a curr

Name: _ Class: _ Date: _
ID: A
quiz4
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. If a proton is released at the equator and falls toward the Earth under the influence of gravity, the ma

Name: _ Class: _ Date: _
ID: A
quiz5
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly t

Physics 1BL
CURRENT AND RESISTANCE
Winter 2009
Introduction
In this lab we will examine the concepts of electric current and potential in a circuit. We first
look at devices (like batteries) that are used to generate electrical energy that we can use in
c

Physics 1B:
Electricity and
Magnetism
Announcements
Eric L. Michelsen
emichels
at physics etc.
6/5/2012
Physics 1B
1
What it will also be
like
6/5/2012
Physics 1B
2
Who am I?
Eric Michelsen
An electrical engineer for a few
decades
BSEE
PhD Physics UCS

Physics 1B:
Electricity and
Magnetism
Part I: Electricity
Eric L. Michelsen
emichels at physics etc.
6/18/2012
1
Charges
Do particle push on each other because they
are charged, or do we say that particles are
charged because they push on each other?
+
1

Version 2 Final Exam: Physics 1B Spring 2012, Dr. Michelsen. You may not bring in anything written.
You will be given the following on the quiz:
You may find some of the following formulas and information useful:
G 6.67 1011 N-m 2 kg 2
g 9.8 m/s2
electron