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Oh yes, this is important, I think. If protons and electrons have the
same KE (meaning very different v) then traveling in the same direction
does not mean that the net B is zero. In a neutral plasma electrons
will contribute much more to B than protons.
Really?
The CURRENT from the positive and negative charges must be the same (or
the sun would be acquiring a net charge). The electrons are moving
faster, but are farther apart. Biot-Savart says that B is proportional
to I. Thus it seems that the two contributions must be equal (in
magnitude anyway), producing a net B = 0.
Or am I missing something?
--- Tim Folkerts
********************************************************
Timothy J. Folkerts Tim.Folkerts@valpo.edu
Dept. of Physics & Astronomy 219-464-6634
Valparaiso University
Valparaiso, IN 46383