PHYS 1B Quiz: Chapter 22
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Magnetic forces: ancient greeks discovered that stones made of magnetite (fe3o4) attract iron, this material is a magnet; the force exerted is a magnetic force. Practical applications of magnets: fasteners for door latches, electric motors, dynamic microphones, loudspeaker, headphones, electric guitar pickups, strip of credit card that encodes information, magnetic hard disk drive for computer data storage. Biomedical applications of magnets: nmr machine (nuclear magnetic resonance) determines protein, dna, rna structures; used in drug design, mri machine (magnetic resonance imaging) Clicker: if you cut a bar magnet in half, you will get 2 magnets, each with one north pole and one south pole. Mag(cid:374)eti(cid:272) poles (cid:272)a(cid:374)"t (cid:271)e separated: ele(cid:272)tri(cid:272) (cid:272)harges (cid:272)a(cid:374) (cid:271)e isolated, (cid:271)ut (cid:373)ag(cid:374)eti(cid:272) poles (cid:272)a(cid:374)"t, no matter how many times a permanent magnet is cut, each piece always has a north pole and south pole. In general, near a pole the magnetic field points away from north poles and points toward south poles.
