Re: U and B : why

On Sun, 09 Mar 2008 10:42:06 +0100, r.ferreol@xxxxxxx wrote:

Hello
Does somebody know the reason of use of B as symbol for magnetic
field and U as symbol for tension ?

Thanks

ferreol@xxxxxxxxxxxxx
homepage :
http://mapage.noos.fr/r.ferreol

I've never seen U used for tension, but B is standard for the magnetic
field. Its origin is Maxwell working his way through the alphabet. See:

http://posner.library.cmu.edu/Posner/books/pages.cgi?call=537_M46T_1873_VOL._2&layout=vol0/part0/copy0&file=0263

http://posner.library.cmu.edu/Posner/books/pages.cgi?call=537_M46T_1873_VOL._2&layout=vol0/part0/copy0&file=0264

rho The radius vector of a point
A The electromagnetic momentum at a point
B The magnetic induction
C The (total) electric current [current plus displacement current]
D The electric displacement
E The electromotive force
F The mechanical force
G or rho dot
The velocity at a point
H The magnetic force
I/J [indistinguishable in the Fraktur typeface he used for vectors]
The intensity of magnetization [usually called M now]
K The current of conduction [usually called J now]

--
Jim E. Black (domain in headers)
How to filter out stupid arguments in 40tude Dialog:
!markread,ignore From "Name" +"<email address>"
[X] Watch/Ignore works on subthreads
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