Quote:
Originally Posted by Stroller
So if there is no differentiation in the field other than a gradual falloff in strength with distance, what causes the bright circular areas of excited electrons in the crt interspersed with non-excited areas?
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What I think is happening here is that you are observing an interference pattern on your screen. What I do not understand in your OP is the following:
Quote:
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Originally Posted by Stroller
I put the polar end of a magnet up against an old crt monitor screen to observe the field. It produced a nice array of small circles, getting larger further away from the magnet. When I rotated the magnet, I expected to see the spots rotate by a similar amount, but they didn't move.
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Not having done this myself (though I have "moved the electron beam sometimes on a monitor with a magnet") did you just see a row of dots or did you see concentric circles around the magnet? If the latter it is most definitely an interference pattern, caused by the presence of an extra magnetic field that "bundles" the electrons. If it were just dots in a row, I am having a harder time to understand what is happening.
Quote:
Originally Posted by Stroller
In your example, once the paperclip overcame the friction of the surface it's sliding across, would it's rapidly increasing momentum not overcome the apparent effect that differentiates lines of iron filings so that you wouldn't be able to spot the variation in the flux strength if there were any?
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As I explained in my reply to this paperclip experiment (but which was nicely ignored) the "lines of force" (or field lines) just describe the direction and the strength of the magnetic field at a certain location. But the field is continuous and differentiable everywhere, which means that if you would go an infinitesimal step in a direction perpendicular to the field line you would be on another field line. So, there is no such corporeal thing as a field line.
For the rest I have no idea what you mean with not being able to "spot the variation in the flux strength" (do you mean field strength or do you mean flux?). And by the way, what actually happens when you put a straightened out paper clip near a magnet?
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Optimism does not change the laws of physics. (T'Pol)
A good scientist has freed himself of concepts and keeps his mind open to what is. (Dao De Jing 27)
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Martin (
http://www.geocities.com/DrMartinV )
24-June-2008, 07:48 AM
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