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S117Lecture122010_000

S117Lecture122010_000 - Magnets Nuclear magnetic...

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Magnets, Nuclear magnetic resonance (NMR), and quarks Magnets and electricity are intimately related – as in the electromagnetic force, a single force. We all know from our experience with magnets as children (refrigerator magnets) what permanent magnets do to each other. They interact. Horseshoe magnet The north pole of one magnet attracts the south pole of the other magnet. The North pole of a magnet points to the magnetic north pole in the earth’s magnetic field (or can be determined with an electromagnet and the right hand rule). Recall that we have learned that the underlying atomic cause of magnetism is unpaired spins!
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A moving charge generates a magnetic field Protons and neutrons “moving” in orbitals in the nucleus generate a magnetic moment for the nucleus. Current and magnetic fields This magnetic field can be measured by placing the current carrying loop in a magnetic field. Neutrons in the nucleus which are uncharged can generate a magnetic moment? YES! (more on that if you take C460 ) How do magnets align? stacked Side to side
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