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Agenda Phys 121 Common Exam 1 Reviews

Prepare for Common Exam 1 covering Lectures 1-4 on Electricity and Magnetism. Review vectors, fields, electric charge, and Gauss's Law. Test includes 16 multiple choice questions.

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Agenda Phys 121 Common Exam 1 Reviews

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  1. AgendaPhys 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 MagnetismLecture 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 MagnetismLecture 3 - Electric FieldPhysics 121 -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 MagnetismLecture 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. Lecture 4 Summary: Gauss’s Law

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