General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2011
Prelude to an Exam
Allegro con brio
Allegro
NextFridayEXAMINATION#2
WatchthoseWebAssigns.nomoreextensions.
Mondaywillbe
AQuizonCircuits
Areviewofcircuitsandsomeotherproblems.
Wednesday,moreonMagnetism.Onlyday1ontheexm.
WatchforanewWebassign.
Magnetism
M
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2011
Physics 2210
Lecture 15
Todays Concepts:
a) Parallel Axis Theorem
b) Torque & Angular Acceleration
Mechanics Lecture 15, Slide 1
Parallel Axis Theorem
Mechanics Lecture 15, Slide 2
ACT
A solid ball of mass M and radius is connected to a rod
of mass m and
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 22
15. By symmetry we see that the contributions from the two charges q1 = q2 = +e cancel each other, and
we simply use Eq. 223 to compute magnitude of the field due to q3 = +2e.
(a) The magnitude of the net electric field is
r
1 2e
1
2e
1 4e
 E
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 23
3. We use
(a)
(b)
(c)
.
, where
2
E A
A Aj 140
. m j
b g
2
6.00 N C i 1.40 m j 0.
2
2.00 N C j 1.40 m j 3.92 N m 2 C.
2
3.00 N C i 400 N C k 1.40 m j 0
.
(d) The total flux of a uniform field through a closed surface is always zero.
10. N
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Fall 2015
NAME #6.?
PHYS 253 uiZ 3 artA :
Answer this question by yourself, without using any notes or the book. The only
items you are allowed are a calculator, writing utensil, and extra blank paper.
Possibl useful formulae and constants: F=qE, f E dA = Qenc/So
k
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Fall 2015
The$Electric$Field$(contd)$
For$a$point$charge:$
Q
E = k 2 r
r
Integrate$over$dq$for$an$extended$charge$distribu>on.$
Other$basic$shapes$for$charge$distribu>ons:$
$
1)$A$ring$with$radius$R,$total$charge$Q:$at$a$distance$z$from$
the$ring,$along$the$axis$pe
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2015
Physics 202
Spring 1999
Midterm 2
Solution
NAME:
SS#:
Recitation section/TA name:
FORM A
Answer ALL 20 questions.
Make sure that you enter your FORM CODE and your SS# on the scan sheet.
You will NOT receive a grade if you forget!
The exam has a time limi
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 24
11. (a) The potential as a function of r is
r
r
0
0
V r V 0 E r dr 0
qr
qr 2
dr
4 0 R 3
8 0 R 3
(8.99 109 N m 2 C 2 )(3.50 10 15 C)(0.0145 m) 2
2.68 104 V.
3
2(0.0231 m)
(b) Since V = V(0) V(R) = q/80R, we have
V R
q
(8.99 109 N m 2 C 2 )(3.
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 21
8. In experiment 1, sphere C first touches sphere A, and they divided up their total charge (Q/2 plus Q)
equally between them. Thus, sphere A and sphere C each acquired charge 3Q/4. Then, sphere C touches
B and those spheres split up their tota
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Halliday/Resnick/Walker
Fundamentals of Physics 8th edition
Classroom Response System Questions
Chapter 28 Magnetic Fields
Interactive Lecture Questions
28.2.1. Consider the two rectangular areas shown with a point P located at the midpoint
between the tw
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Physics 212 Lab Section 1
Lab #12 The Series RLC circuit
Connor Cardenas
Partner's Name:
David Peralta
Instructor:
Dr. Forrey
Purpose
In this lab our objective was to study the behavior of a resistor, capacitor and
inductor in a series ac circuit. To do t
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Physics 212 Lab Section 1
Lab #12 The Series RLC circuit
Connor Cardenas
Partner's Name:
David Peralta
Instructor:
Dr. Forrey
Purpose
In this lab our objective was to study the behavior of a resistor, capacitor and
inductor in a series ac circuit. To do t
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Physics 212 Lab Section 1
Lab #9 Magnetic Field of Circular Coil
Connor Cardenas
Partner's Name:
David Peralta
Instructor:
Dr. Forrey
Purpose
In this lab our objective was to look at the behavior of a magnetic field along
the axis of a circular coil. To d
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 28
6. The magnetic force on the proton is given by r
where q = +e . Using Eq. 330 this
r r
F qv B,
becomes
(4 1017 )i + (2 1017)j = e[(0.03vy + 40)i + (20 0.03vx)j (0.02vx + 0.01vy)k]
with SI units understood. Equating corresponding components, w
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Physics 212 Lab Section 1
Lab #7 Magnetic Field Wire
Connor Cardenas
Partner's Name:
David Peralta
Instructor:
Dr. Forrey
Purpose
In this lab we attempted to verify the relationship
F il B sin
.
The purpose
of this lab is to investigate the magnetic forc
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Physics 212 Lab Section 1
Lab #6 RC Constant
Connor Cardenas
Partner's Name:
David Peralta
Instructor:
Dr. Forrey
Purpose
In this lab we measured the time constant of an RC Circuit. We studied the
behavior of the time dependent potential difference throug
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 26
7. The crosssectional area of wire is given by A = r2, where r is its radius (half its thickness).
The magnitude of the current density vector is
J i / A i / r2,
so
i
0.50 A
1.9 104 m.
4
2
J
440 10 A/m
r
The diameter of the wire is therefor
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Halliday/Resnick/Walker
Fundamentals of Physics 8th edition
Classroom Response System Questions
Chapter 27 Circuits
Interactive Lecture Questions
27.3.2. A nonideal battery has a 6.0V emf and an internal resistance
of 0.6 . Determine the terminal voltag
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 25
4. (a) We use Eq. 2517:
C 4 0
40.0 mm 38.0 mm
ab
84.5 pF.
b a 8.99 109 Nm2 2 40.0 mm 38.0 mm
C
(b) Let the area required be A. Then C = 0A/(b a), or
A
C b a 84.5 pF 40.0 mm 38.0 mm
191cm 2 .
12
2
2
0
8.85 10 C /N m
14. (a) The potentia
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Chapter 27
24. We note that two resistors in parallel, R1 and R2, are equivalent to
1
1 1
R12 R1 R2
R12
R1 R2
.
R1 R2
This situation consists of a parallel pair that are then in series with a single R3 = 2.50 resistor.
Thus, the situation has an equiv
General Physics: Electricity and Magnetism REQS RGSTR IN 212L
PHYS 212R

Spring 2014
Halliday/Resnick/Walker
Fundamentals of Physics 8th edition
Classroom Response System Questions
Chapter 25 Capacitance
Interactive Lecture Questions
25.2.1. How much charge is on the plates of a 11F capacitor that has
been connected to a 120 V dc power s