Unit 5: Electricity and Magnetism

Zitzewitz et al., Merrill Physics, 1995, Chapters 20 - 26

Useful links

Electric field applet (Caltech Physics) (http://www.cco.caltech.edu/~phys1/java/phys1/EField/EField.html). I suggest you start by deselecting everything but Electric Field Lines. The horizontal scroll bar determines the sign and magnitude of charges you place in the field by clicking in the black space.

Electrodynamics simulator (Paul Falstad) (http://www.falstad.com/emwave2/) A simulation that demonstrates magnetostatics and electromagnetic waves in two dimensions. See especially setups for: Single Wire, Wire Pair (currents in same direction) Dipole Wire Pair (currents in opposite directions) Solenoid, and Moving Magnet in a Tube.

Charged particle in a magnetic field (Surendranath Reddy) (http://www.mta.ca/faculty/science/physics/suren/MovChgMag/MovChgMag.html).

Charged particle in electric & magnetic fields (Surendranath Reddy)

(http://www.al.lu/physics/Applets%20+%20Simulations/Premi%C3%A8re/7%20Particule%20dans%20un%20champ%20B/Particule%20dans%20E%20et%20B%20(3%20dim)/MovChgEleMagApplet.htm) I suggest you start by setting either the electric field to zero in all three dimensions.

Magnetic field of a bar magnet (Walter Fendt) (http://home.a-city.de/walter.fendt/phe/mfbar.htm) Dragging the compass needle to various locations causes magnetic field lines to appear.

Generating a plane electromagnetic wave (David Northridge) (http://web.mit.edu/jbelcher/www/java/plane/plane.html#Inst) Moving the sheet of positive charge relative to the sheet of negative charge gives rise to a propagating wave of electric and magnetic fields with field vectors parallel to the sheets. See accompanying text as well.

Reflecting a plane wave (David Northridge) (http://web.mit.edu/jbelcher/www/java/reflect/reflect.html) Moving a sheet of positive change gives rise to a propagating electromagnetic wave that causes charges to move in a reflecting sheet, canceling out waves beyond the sheet and producing a reflected wave the propagates back toward the source. Note toggle between incident and total field. Easy to see the standing waves!

Properties of electromagnetic waves:

Speed of light (Alwyn Botha): (http://www.what-is-the-speed-of-light.com/)

Electromagnetic spectrum (MicroWorlds): (http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html)

Propagation of electromagnetic waves (Prof. Hwang) (http://www.phy.ntnu.edu.tw/~hwang/emWave/emWave.html)