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---->-- q --->--- q'
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^
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[There is] .... at the
location of q a magnetic field generated by q' that is pointing out
of the screen toward the viewer. ... q', being in a no-field location,
has no magnetic force exerted on it by q.
This is a very strong violation of N3.
We really can't very well dismiss such magnetic forces as
being a negligible relativistic effect since it is responsible for
making nearly all kinds electric motors work (that along with the
forces of constraint).
Certainly one can easily deal with momentum conservation for
momentum transfers between particles and force-fields when one also
considers the field momentum possessed by the fields themselves.
But there seems to be a problem that develops with an *N3* assignment
saying that a particle exerts a force on a field at some location
because it requires that the field at that location also transmit
that force to its various neighboring spatial neighbors at different
locations in space as the momentum is locally transferred across the
spatial reaches of the field.