# Electricity, Magnetism, & Optics (5)

## UM-StL Evening Physics 112 - Winter/Spring 2000

Boiler Plate: A phenomenological introduction to the concepts and laws of electricity and magnetism, electromagnetic waves, optics and electrical circuits for physics majors and students in other departments. Three hours of (interactive) lecture, one hour of discussion, and two hours of laboratory per week.

### What's New?

• Find some Spring 2001 web-construction on the UM-StL BlackBoard site by using your gateway ID/password.
• Discover time-dilation, length-contraction, and Lorentz-transforms via Minkowski's "spacetime Pythagorean theorem".
• Check out how one might prepare for constant acceleration at any speed, from scratch.
• Explore possible web-delivery of exams, quizzes, group discussions, grades & more, here.
• Check out our challenge to figure some rules of anyspeed motion from experiment!
• Use a java-smart browser to explore web sims at MSstate, RMWC, Davidson, and BYU.
• A previous 1st exam (1,2,3,4).
• A previous 2nd exam (1,2,3,4).
• A previous 3rd exam (1,2,3,4).
• A previous 4th exam (1,2,3,4).
• A previous final exam (1,2,3,4,5)
• Links reported by James Laird on fields, levitating life & railguns (A,B,C,D,E,F).
• This course now has a university-wizarded webpage and discussion area.
• Ask in class for the discussion password if you don't have it. The pre-course login ID is [`Physcs112.E0A`], while the pre-course password is [`Physcs112.E0A`].

• How many excess electrons are needed to stick a balloon to the ceiling?
• How wide is the ionized column during a lightning strike?
• What happens to gravity at the earth's center?
• How much excess charge is needed to make a 6-inch human hair stand on end?
• How can we make portable the power needed to restart a fibrillating heart?
• Why don't we for fun use like-charged floors and body-suits to cancel gravity?
• Electrons speeding from your car battery to starter motor take how long?
• What it is about an electric guitar that enabled Jimi Hendrix to do new things?
• Does higher voltage make power line magnetic fields larger or smaller?
• How does relativistic length-contraction keep your refrigerator magnets from falling?
• Why don't electric eels shock themselves?
• If you put one of the two batteries into a flashlight backwards, what happens?

Other local resources of possible interest:

• Excerpts from an any-speed primer.
• Browser-interactively solve your own constant-acceleration problems.
• Start relativity with the metric equation instead of Lorentz transforms!.
• Does making a hotdog require 50 nanoseconds of life's power stream?
• Figure traveler time on a "1-gee" trip to Andromeda galaxy.
• Try focussing a high-res electron microscope image on-line!
• How are Balinese candle-dancing and electron spins connected?
• Is statistical physics dead, or is there a paradigm change afoot?
• deBroglie's electrons and some amazing TEM facts.
• In preparation: assignment list, example tests, course calendar, homework/exam solutions...
• At UM-StLouis see also: a1toc, cme, i-fzx, phys&astr, programs, stei-lab, & wuzzlers.
• Some current and previous courses: p111, p112, p231, p341, p400.
• This release dated 23 Feb 1999 (Copyright by Phil Fraundorf 1988-1996)
• Since 7 Feb 1997, you are visitor number .

• SUNY-Buffalo Physics 108C E&M Lecture Notes by R. J. Gonsalves
• SUNY-Buffalo Physics 207 Optics Lecture Notes by R. J. Gonsalves
• Kenny Felder's Math and Physics Help pages.
• Univ. Oregon Student Physics Problems Page
• Strategies for Using Gauss' Law
• Charge on Capacitors in Series
• A couple of links from Kim Waggoner on the earth's magnetic field, and its simulation.
• Press below for Alta-Vista's Dynamic Link-Lists on these topics...

• Halliday, Resnick & Walker's Physics (John Wiley & Sons)
• Jearl Walker, Flying Circus of Physics (John Wiley & Sons, 1975)
• Michio Kaku, HyperSpace (Oxford University Press, 1994)
• James Gleick, Chaos: Making a New Science (Penguin Books, 1987)
• Stuart Kauffman, At Home in the Universe (Oxford University Press, 1995)
• Kip S. Thorne, Black Holes & Time Warps (W. W. Norton & Co., 1994)
Marginal Explorations:
• Richard Feynman's Surely You're Joking, Mr. Feynman
• Eric Drexler, Engines of Creation
• Mark Slouka, War of the Worlds (BasicBooks, 1995)
• Richard Dawkins, The Selfish Gene (Oxford University Press, 1976)

Visualizing some Possible Exam Problems:

DiPole, DiWire, {+2-1} Charge Triplet Equipotential Lines around Scattered Charges

`Can you draw in the field lines?`

Eligibility: Physics 111 and Math 175 are prerequisites. If you earned a grade of D or F in either one of these courses, you do not qualify to take Physics 112.

Text: Physics for Scientists and Engineers (4th Edition), by Serway

Lecture/Peer-Instruction: P. Fraundorf, T & R 5:30-6:45pm, B115 Benton. Office hours: T 4:30-5:30pm or by appointment, M202.

Laboratory: Tuesdays 6:55-8:45pm, B335 Benton Hall. The lab will consist of a series of experiments for which detailed instruction sheets are provided in the manual (by Loyd) accompanying the textbook. You will be expected to have studied the instruction sheets and to have completed the "Pre-Lab Assignment" beforehand. (Your teaching assistant may be consulted briefly a few days before the experiment is performed.) The pre-Lab is worth a third of the lab grade. Also, be sure to participate in all the experimental work during the lab session as each of you will be tested on the details of the lab work at the end of the semester.

Discussion: T & R 5:05-5:30 pm B115 Benton Hall. The discussions will start the first Thursday of the semester.

Homework: Each of the assigned problems (see attached sheet) will be worth 1 point. No late hand-in's will be accepted. Supplemental homework problems, undiscovered errors in the book that you bring to our attention, and classroom activities (e.g. presentations and quizzes), may let you increase your homework score as well.

Current Homework Sheet:

Exams: There are four hour-long in-class exams and one final (see attached Syllabus). There will be no make-up exams given. A missed exam is entered as 0% in your grade statistics.

Current Syllabus:

Grades: Labs (pre-lab, report, & test) count 20%, homework and quizzes 20%, a comprehensive final 20%, and three or four in-class hour-exams making up the remainder toward your final grade. Numerical letter grades (e.g. A>=4.0, 3.0<=B<4.0, 2.0<=C<3.0, etc.) for each of the above activities will be set equal to CourseSD*[(N-M)/S)] + CourseMean. Here N is the number of points you receive for that activity, {M, S} are the class mean and standard deviation for the activity, and {CourseMean, CourseSD} are the final grade mean and standard deviation for the whole course. After each exam, I will give you values of M and S as well as your score N, so that you can calculate a numeric grade for the exam. Use CourseMean="3.0" and CourseSD="1.0" for this estimate. The exact value for CourseMean (usually up, nearer to 3.1) and CourseSD (usually little changed) will be chosen after the final, to reflect overall class performance and to minimize grade roundoff error for individuals just beneath a cutoff.

Drops: The University regulations regarding drops will be strictly enforced. You may drop without a grade prior to 4 February 2000. After that date you will receive the grade you have earned up to the point of the drop.

Symbols: Make sure that you know the Greek alphabet and special Mathematical Symbols, which will be constantly used in this course. Consult the back cover of the textbook.

MathReview: There is a very useful collection of trigonometry, and differential and integral calculus formulae in the back of the text for quick reference and review (Appendix B). Make sure that you know this material!