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You evidently missed the stuff leading up to this. There were
postings by a bunch of wild-eyed radicals who want to disown
pseudovectors.
Regards,
Jack
On Mon, 19 Aug 2002, Bob LaMontagne wrote:
I'm confused by your clarification. How is this a velocity selector? Are the
electrons injected through the side of the solenoid along the z axis?
Since the magnetic force is inherently described by vector manipulation - or some
equivalent mnemonic (I'm assuming this is a presentation for an introductory
General Physics course) - what is the meaning of not "invoking the right-hand
rule"?
Bob at Providence College
Jack Uretsky wrote:
Take the y-axis to be the axis of a very long solenoid. The
current, as looked at from the negative end of the axis, circulates
clockwise, creating a uniform magnetic field inside the solenoid. A
uniform electric field inside the solenoid is directed along the positive
x-axis, |E| < |B| . It is known that such an apparatus is a velocity
selector for electrons. Tell me how to quickly argue the
direction of the velocity that is selected by this apparatus without
invoking the right-hand rule. The path of such electrons, by the way,
complete with circles, is shown in Jackson's book, 2d Ed., p. 583.
--
"But as much as I love and respect you, I will beat you and I will kill
you, because that is what I must do. Tonight it is only you and me, fish.
It is your strength against my intelligence. It is a veritable potpourri
of metaphor, every nuance of which is fraught with meaning."
Greg Nagan from "The Old Man and the Sea" in
<The 5-MINUTE ILIAD and Other Classics>