Problem 3 in the fourth edition of Halliday, Resnick, and Walker reads: A
simple bar magnet hangs from a string as in Fig. 34-19. A uniform
magnetic field B directed horizontally to the right is then established.
Sketch the resulting orientation of the string and magnet. (Fig. 34-19
shows a bar magnet hanging from the ceiling by a string attached to its
south-pole end. The string and the magnet are vertical.)
I got this one wrong and my wrong answer was reinforced becaused it was
the same as the answer in the Solutions Manual. Only after I put it on a
final exam did I find out (from a colleague) what the right answer is.
(The string remains vertical but the magnet does not.) This makes a very
nice statics problem. Unfortunately, it does not appear in the fifth
edition.
Gene
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Eugene (Gene) P. Mosca Phone 410-293-6659 Office
Physics Department 410-267-0144 Home
572 Holloway Road 610-683-3597 Summer
U.S.Naval Academy Mailstop 9C, Michelson Rm 339
Annapolis MD 21402 email: mosca@nadn.navy.mil
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