Lect06 - Magnetism Magnetism Magnetic force & field...

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1 Magnetism • Magnetic force & field lines • Force on a moving electric charge (19.1,2,5) 9/26/11 Physics 104, Fal 2011 1 Magnetism 9/26/11 Physics 104, Fal 2011 2 Magnets are Cool! • North Pole and South Pole – Unlikes Attract – Likes Repel • Earth’s a magnet 9/26/11 Physics 104, Fal 2011 3 Earth is a Magnet As a bird flies, the distance between the Earth’s magnetic north-pole and its geographic north-pole is about: 1. Negligible 2. 1000 miles 3. twice radius of Earth 4. π times radius of Earth 9/26/11 Physics 104, Fal 2011 4 North magnetic pole is about half way around the Earth ( π R E ) from the North geographic pole Let’s Break A Magnet! • North Pole and South Pole – Are inseparable 9/26/11 Physics 104, Fal 2011 5 No Magnetic Charges • Magnetic Fields are created by moving electric charge! • Where is the moving charge? 9/26/11 Physics 104, Fal 2011 6 Orbits of electrons about nuclei Intrinsic “spin” of electrons (more important effect)
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2 Field Lines of Bar Magnet
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Lect06 - Magnetism Magnetism Magnetic force & field...

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