AP1200_Ch6_Magnetism-2008

AP1200_Ch6_Magnetism-2008 - 1 AP1200 AP1200 6. Magnetism...

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Unformatted text preview: 1 AP1200 AP1200 6. Magnetism Concepts 6. Magnetism Concepts Michel A. Van Hove Michel A. Van Hove WARNING: PRINTING THIS DOCUMENT WILL USE MUCH INK AND WILL NOT SHOW ANIMATIONS. 2 Learning objectives for magnetic fields Learning objectives for magnetic fields You should become able to: describe and relate the physical principles of magnetic fields, magnetic forces and induction calculate simple magnetic fields and related electric currents and forces 7 3 Further reading and research Further reading and research You will find many learning tools, including Java applets (interactive on- line demonstrations), at: http://www.merlot.org/ at top right, enter search keywords (e.g. optics) http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfie.html describes various aspects of magnetic fields and forces Consult our lecture notes, and the recommended textbooks More web links are provided in these Powerpoint files 8 4 Warning: copyright Warning: copyright Most of the images shown here were downloaded from the web, without asking owners/authors: The owners/authors included no ban on use Copyright must still be respected: The images can be used for educational purposes only; we/you may not make money with them 6 5 Importance of magnetic fields Importance of magnetic fields Magnetic fields are needed for all these applications: magnetic coils magnetic levitation/propulsion magnetic data storage (motors, transformers,…) electric power electric motors magnetic resonance imaging 8 6 Magnetic fields Magnetic fields Oldest use: compass 5 7 Magnetic fields Magnetic fields magnets line up with a magnetic field: this orientation defines the direction of the magnetic field B the torque experienced by a magnet is proportional to the magnetic field strength B B 6 8 Magnetic fields Magnetic fields magnetic properties of solids a bar magnet creates a magnetic field because of electrons spinning in its atoms this microbe (Aquaspirillum Magnetotacticum) contains small magnets (yellow) and can orient itself relative to the Earth’s magnetic field (size ~ 0.3 micron) every electron spins inside each atom, forming a small magnet 7 9 Magnetic fields Magnetic fields Earth’s magnetic field aurora borealis (northern lights) S N Earth’s “magnet” is “reversed”!...
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This note was uploaded on 04/17/2011 for the course AP 1200 taught by Professor Michela.vanhove during the Spring '10 term at City University of Hong Kong.

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AP1200_Ch6_Magnetism-2008 - 1 AP1200 AP1200 6. Magnetism...

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