Agenda
Phys 121 Common Exam 1 Review
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Exam overview & mechanics
Sample Exam # 1 or # 4
Other Sample Problem Sets
Open Agenda
Exam Mechanics and Scope
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The exam covers Lectures 1 – 4, comprising material in Chapter 21,
Chapter 22.1 – 5. and some selected material from the introductory
lecture (see the course syllabus).
There are 18 multiple choice questions. 100% on the exam means 16
questions answered correctly. It is possible to score greater than
100%.
Students are expected to show work on the question paper in order
to get credit for answering questions correctly. There is otherwise no
penalty for wrong answers.
Circle your chosen answers on the test paper as well as on the
Scantron sheet.
Use the back of the test paper if you need more room to do scratch
work. For long questions, tell the grader to look there.
Bring calculator & #2 soft pencils for marking the SCANTRON forms.
A formula sheet will be provided. It is at the end of the exam package
and is identical to the one posted on Janow’s web site.
Turn off cell phones, pagers, laptop computers, any other
communication devices or noise makers.
A suggestion: first work the problems you know how to do, then
come back and finish the ones that are doubtful.
Be sure to comply with the Honor Code Pledge.
Electricity and Magnetism
Introduction to Physics 121
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Syllabus, rules, assignments, exams, etc.
iClickers
Quest
Course content overview
First Lecture: Intro
• Review of vector operations
• Dot product, cross product
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Scalar and vector fields in math and physics
Gravitation as an example of a vector field
Gravitational flux, shell theorems, flow fields
Methods for calculating fields
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Electricity and Magnetism
Lecture 2 - Electric Charge
Physics 121
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- SJ Chapter 23, Sec. 1 - 3
History
Electromagnetism
Electric Charge
Quantization of Charge
Structure of Matter
Conservation of Charge
Conductors and Insulators
Coulomb’s Law – Force
Shell Theorem
Examples
Summary
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Summary: Chapter 21: Electric Charge
Charge:
Matter:
Coulombs
Law:
Vector
Form:
Superposition
Shell Theorem
Lecture 2
Electricity and Magnetism
Lecture 3 - Electric Field
Physics 121 - Chapter 23 Sec. 4 – 7 (See also 26.6)
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Recap & Definition of Electric Field
Electric Field Lines
Charges in External Electric Fields
Field due to a Point Charge
Field Lines for Superpositions of Charges
Field of an Electric Dipole
Electric Dipole in an External Field: Torque and
Potential Energy
Method for Finding Field due to Charge
Distributions
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Infinite Line of Charge
Arc of Charge
Ring of Charge
Disc of Charge and Infinite Sheet
Crossed Electric Fields: CRT example
Summary
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Summary: Electric Field
Lecture 3

E 
dq
k
dist e r 2 r̂
Physics 121 Lecture 04 - Gauss’ Law
SJ Chapter 24 Sec. 1 - 4
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Gaussian Surfaces
Flux Example: Flowing Water
Flux of an Electric Field
Gauss’ Law
Gauss’ Law Near a Dipole
A Charged, Isolated Conductor
Gauss’ Law: Charged Conducting Infinite Sheet
Spherical Symmetry: Conducting Shell with Charge Inside
Cylindrical Symmetry: Infinite Line of Charge
Field of Non-Conducting Sheet
Conducting and Non-conducting Plate Examples
Proof of Shell Theorem using Gauss Law
Examples
Summary
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Summary: Gauss’s Law
Lecture 4