1. Agenda Phys 121 Common Exam 1 Reviews
Exam overview & mechanics
Solve Sample Exam # 1 (and # 3 if time) (Friday)
Sample Exam # 4 (and # 2 if time) (Saturday)
Other Sample Exams and Problem Sets
Open Agenda if time

2. Exam Mechanics and Scope
The exam covers Lectures 1 – 4, comprising material in Chapter 21, 22, and some selected material from the introductory lecture (see the course syllabus).
There are 16 multiple choice questions. 100% on the exam means 16 questions answered correctly. Extra credit questions are no longer offered.
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.

3. Physics 121 - Electricity and Magnetism Lecture 01 - Vectors and Fields
Review of Vectors :
Right Handed Coordinates
Spherical and Cartesian Coordinates in 3D.
Scalar multiplication, Dot product, Vector product
Example: find the surface area of a Sphere
Field concepts:
Scalar and vector fields in math & physics
How to visualize fields: contours & field lines
“Action at a distance” fields – gravitation and electro-magnetics.
Force, acceleration fields, potential energy, gravitational potential
Flux and Gauss’s Law for gravitational field: a surface integral of gravitational field
More math:
Calculating fields using superposition and basic integrals
Path integral/line integral
Example: field due to an infinite sheet of mass

4. Electricity and Magnetism Lecture 2 - Electric Charge Physics 121 - 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

5. Summary: Chapter 21: Electric Charge
Lecture 2
Charge:
Matter:
Coulombs
Law:
Vector
Form:
Superposition
Shell Theorem

6. Electricity and Magnetism Lecture 3 - Electric Field Physics Chapter 23 Sec. 4 – 7 (See also 26.6)
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
Infinite Line of Charge
Arc of Charge
Ring of Charge
Disc of Charge and Infinite Sheet
Crossed Electric Fields: CRT example
Summary

7. Summary: Electric Field
Lecture 3

8. Physics 121 - Electricity and Magnetism Lecture 04 - Gauss’ Law Y&F Chapter 22 Sec. 1 – 5
Flux Definition (gravitational example)
Gaussian Surfaces
Flux Examples
Flux of an Electric Field
Gauss’ Law
Gauss’ Law Near a Dipole
A Charged, Isolated Conductor
Spherical Symmetry: Conducting Shell with Charge Inside
Cylindrical Symmetry: Infinite Line of Charge
Field near an infinite Non-Conducting Sheet of Charge
Field near an infinite Conducting Sheet of Charge
Conducting and Non-conducting Plate Examples
Proof of Shell Theorem using Gauss Law
Examples
Summary

9. Summary: Gauss’s Law
Lecture 4