pg. 1/4
Experiment 1
Electric Charges
OBJECTIVE
To investigate the behavior of electric charges
To investigate charging an object by contact as compared to charging an object by induction
To investigate the distribution of charge on a conducting object
,\
.A A
Name & Section-
Saunders Physics 133 -- Electromagnetism --Exam 1
° You must do and show/explain your own work. Partial credit will be awarded. However,
a correct answer without explanatory material will not receive full credit.
0 Clearly ind
27.8. Model: The electric flux flows out of a closed surface around a region of space containing a net
positive charge and into a closed surface surrounding a net negative charge.
Visualize: Please refer to Figure EX27.8. Let A be the area of each of the
25.3. Model: Use the charge model and the model of a conductor as a material through which electrons move.
Solve: (a) The charge of the glass rod decreases from +12 nC to +8.0 nC. Because it is the electrons that are
transferred, 4.0 nC of electrons has b
26.4. Model: The electric field at the point is found by superposition of the fields due to the two charges
located on the y-axis.
q
q.
Visualize: The electric field due to the positive charge 1 at the point is away from 1 On the other hand, the
q
q.
elec
29.5. Solve: The work done is exactly equal to the increase in the potential energy of the charge. That is,
W U qV q(Vf Vi ) (10 106 C)(15 V) 15 106 J
Assess: The work done by the escalator on the charge is stored as electric potential energy of the charg
33.1. Visualize:
To develop a motional emf the magnetic field needs to be perpendicular to both the velocity and the current, so
lets say its direction is into the page.
Solve: This is a straightforward use of Equation 33.3. We have
Assess: This is about
32.4. Model: The magnetic field is that of a moving charged particle.
Visualize:
The first point is on the x-axis, with
is in the yz plane with
a 90.
The second point is on the z-axis, with
b 0,
and the third point
c 45.
Solve: (a) Using the Biot-Savart l
28.2. Model: The mechanical energy of the electron is conserved. A parallel-plate capacitor has a uniform
electric field.
Visualize:
The figure shows the before-and-after pictorial representation. The electron has an initial speed
vi 0 m/s
and a
final spe
31.4. Model: Assume ideal connecting wires and an ideal battery for which
Visualize: Please refer to Figure EX31.4. We will choose a clockwise direction for I. Note that the choice of the
currents direction is arbitrary because, with two batteries, we may
Physics Experiments 133
F-1
Experiment F
Earth's Magnetic Field Measurement
To measure the
local Earth magnetic field and the field of a
current-carrying circular coil of wire.
Experimental Objectives:
Compass, circular coil of wire,
power supply, wires,
PHYSICS EXPERIMENTS 133
Electric Field, Part I
Electric Field-
Electric Field -
PHYSICS EXPERIMENTS -133
GOAL
to determine the electric vector eld for a point charge.
to examine the spatial dependence of the strength of the electric eld for a point char
Lab 8 Report
Experiment Date: November 13, 2015
Measurement of Earths magnetic field and the field of a circular coil of wire with current
Introduction and theory: Derived from the Biot-Savart law, the magnetic field at the center of a
circular coil of wi
PHYSICS EXPERIMENTS 133
Current Balance-1
Current Balance Warm Up
1. Force between current-carrying wires
Wire 1 has a length L (where L is "long") and carries a current I0. What is the magnitude of the magnetic
field a distance R from the wire? Give you
PHYSICS EXPERIMENTS 133
Current Balance-1
Current Balance
GOAL.
To measure the magnetic force between two wires.
To experimentally determine the permeability constant,
To determine the mass of an unknown.
.
EQUIPMENT.
Current balance with laser
Frac
PHYS 133- WINTER 2008 WEEK 4, CHAPTER 29
29.2. Model: The mechanical energy of the electron is conserved. A parallel plate capacitor has a uniform
electric field. Visualize:
The figure shows the before-and-after pictorial representation. The electro
PHYS 133, WEEK 2 CHAPTER 26
26.4. Model: The electric field is that of the two charges located on the y-axis.
Visualize: Please refer to Figure Ex26.4. We denote the positive charge r q1 and the negative charge by q2. The electric by r field E1 of t
PHYS 133 WINTER 2008 WEEK 6, CHAPTER 31
31.4. Solve: The potential difference between the ends of a copper wire that carries a current can be obtained
from Ohm's law and the relationship R = ! L A . Finding the resistivity of copper from Table 30.1,
PHYS 133, WEEK 1 CHAPTER 25
25.2. Model: Use the charge model.
Solve: (a) In the process of charging by rubbing, electrons are removed from one material and transferred into the other because they are relatively free to move. Protons, on the other h
PHYS 133 WEEK 3 CHAPTER 28
28.3. Solve: Using Equation 28.3 and Table 28.1, the electron current is
i = nAv d = 5.9 ! 10
(
28
m
"3
)# ( 0.5 ! 10
"3
m
) (5.0 ! 10
2
"5
m / s = 2.3 ! 10
)
18
s
"1
The time for 1 mole of electrons to pas
N am e_
Final Exam A
(You m ay x out one problem for it to not be grad ed , otherw ise, the last problem w ill not
b e grad ed .)
P hysics 133
Spring 2011
Z am m it
1. (10) A m etal ball of rad ius 2.0 m has 3.2 m C of charge. Find the charge d ensity
for
7. Current is flow ing in the d irection show n. It is increasing. Show the
m agnetic flux in the transform er core. Show the d irection of the current in the
25 r esistor. If the pow er supply provid es a sine w ave of 150 v for the peak
v oltage, w hat
Physics 133, Prof. G. Gillen, Midterm Exam, 10/17/12
Name
To receive full credit, show all of your initial equations and all of your work.
Please circle your answer to each question. If you need extra space, use the back of the same sheet of
paper as the
Chapter 29 Quiz Equations
Name
V =k
q
,
r
rr
U = p E = pE cos
Vnet = V ,
q1q2
r12
U e = qV ,
Ue = k
rr
W = F d ,
U = qEs ,
r
E=
2 o
r
E=
o
,
Q
2 o R
2
r
(R
2
+ z2 z
x(t ) = xo + vo t +
k=
1
4 o
= 9 10 9
o = 8.85 10-12
qi q j
i< j
KE =
12
mv
2
V =k
rij
Q
Potential&Field- pg. 1
Electric Potential and Field
RECITATION
Q1. Calculating electric potential & relating it to the electric eld.
In a previous experiment you studied the electric eld due to a dipole charge conguration. In particular,
you calculated th
Lab 3 Report
Experiment Date: October 9, 2015
Measurement of magnitudes and directions of electric fields produced by a dipole
Introduction and theory: It is known by the Pythagorean Theorem that the magnitude of an
electric field can be calculated. The f