1. Electromagnetism Project One Introduction
Kyle Godin
Advisor(s): Dr. EH Yang and Dr. Stefan Strauf
NJ Alliance for Engineering Education: A GK-12 Program
Stevens Institute of Technology
Hoboken, NJ
NHRHS 2012
Not going to cover any history of Maglevs, or currently operating ones or projects or anything
Supported by the National Science Foundation GK-12 Program, Grant No. DGE Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.

2. Electricity Image: UK Power Networks
Basic circuits – need to have complete loop
Current flows from positive to negative (but actually reverse because e- are mobile)
Drift veloity of few cm/s versus signal velocity of near the speed of light
Image: UK Power Networks

3. Intel
TeslaDownUnder
ZME Science
Germany.
Magnets lift up from below.
Unstable – you have to continuously vary the magnet strength in a feedback loop in order to get the correct height.
Image from Transrapid.de
University of Alabama

4. Magnetism
Alexander Wilmer Duff

5. Anandtech.com
Jeannelle
Midlifebyfarmlight
Wsg4.com

6. Michael Faraday
A lot of dudes, Faraday, Ampere, Maxwell, etc. Faraday believed in fields when others didn’t. Faraday sucked at math. Einstein kept photos of Faraday, Maxwell, and Newton in his office.

7. Electromagnetism Maxwell’s Equations James Clerk Maxwell 1861
E and M are the same thing.
Maxwell’s Equations.
Everything you experience is either EMAG or gravity. So if its not gravity, it is due to electric or magnetic things. Sight, sound, touch, blah, chemical reactions.
Gauss’ Law: get electric field from electric charges. 2: there are no magnetic charges. Faraday’s Law: changing magnetic field produces an electric field. Ampere’s Law: changing E field nets you B. Or! Electric currents net you B.
Maxwell – speed of light
Image: Loo Kang Wee (lookang)

8. Ampere: Magnetic Field Around a Wire
Demonstration One
Image: Hyperphysics

9. Magnetic Field of a Current Loop (Solenoid, Inductor, Voice Coil, Electromagnet)
Replace u0 with u for non-vacuum core. Iron core gets you higher magnetic field. ur = 5000 for pure iron.
Demonstration 2.
Image: Hyperphysics

11. An aside: sound waves
Mediacollege.com

12. AC (alternating current)
Voltage
Time

13. Sound Wave
Air Density
Time

15. Your Project: Build your own home-made speaker