1. Magnetic Force Introduction Magnetic force on moving charge Examples Magnetic deflection animation x and o diagrams More examples Magnetic force on current-carrying wire Still more examples

2. Magnetism and Induction Magnetism is weird. It’s like a correction to electric forces when charges are moving, and corrections are always weird. – Electric affects charges, magnetism affects charges in motion – Electric causes linear accelerations, magnetism causes sideways deflections (RH rule) Magnetism is very, very (societally) important! – Motors, generators, loudspeakers, credit cards, hard drives, transformers…….

3. Magnetic Force on moving charge

4. Right-hand rule Hand in direction of v Bend in direction B Thumb points in direction of F Alternative right hand rules

5. Example - Magnetic Force on moving charge

6. Example 2 - Magnetic Force on moving charge F v

7. Magnetic force video mp4 video

8. X’s and O’s Simplify diagrams – B field out of or into plane of paper B coming out B going in (+) deflects to right (-) deflects to right

9. Circular motion in magnetic field

10. http://objetoseducacionais2.mec.gov.br/bitstream/handle/mec/23847/ciclotronE.swf?sequence=1

11. Examples – Force on Moving Charge Problem 11 – Direction of force Problem 12 – Direction of field

12. More examples – Force on Moving Charge

13. Magnetic Deflection http://neutrons.ornl.gov/facilities/SNS/works.shtml

14. Magnetic Deflection

15. Force on Current-carrying wire

16. Summary – 2 magnetic force laws

17. Example 20-1

18. Example 20-2

19. Problem 7

20. Magnetron - Microwave ovens

21. Magnetron - Details Magnets top and bottom

22. Magnetron - History Amazon.com Tuxedo Park : A Wall Street Tycoon and the Secret Palace of Science That Changed the Course of World War II Paperback – May 6, 2003 by Jennet Conant (Author)Jennet Conant The untold story of an eccentric Wall Street tycoon and the circle of scientific geniuses he assembled before World War II to develop the science for radar and the atomic bomb. Together they changed the course of history. helped defend Britain from the Blitz! Could now put radar in planes!

23. Magnetism and Induction Flowchart lawchangefieldCurrentforcedirectexamples Force Law 1B →qv →F = qv x BRHR 1charge deflection picture tube Force Law 2B →i →F = il x BRHR 12 wires, motor, loudspeaker Ampere’s Law B = μ o i/2πr← iRHR 2electromagnet solenoid Faraday Induction d/dt →Φ = B*A →ε = dΦ/dt i = ε/R Lentzgenerator transformer Magnetic field plus moving charge/current creates force