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Re: mag field of infinite wire

From: "Carl E. Mungan"
. . .You may not use Biot-Savart . . .

Why? However you slice it, it is the cross product in the Biot Savart law
that forbids any z component in the B field generated by a current in the
z direction! It is not something additional imposed by any specific
symmetry.

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor