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It is the classic question of whether or not a magnetic field can produce a. ^^^^^^^^ ???
force on a stationary charge. I pose the question in the following limited
way. I have a UNIFORM magnetic field that is pointing out of the page (as we
say in textbooks or exams). A proton at a particular instant has a velocity
within the plane of the page pointing to the left. It experiences a force at
that moment toward the top of the page.
Many texts then ask the question, based on relativity, that if we consider
the electron to be at rest and that the uniform magnetic field is produced
by a huge set of pole pieces or a Helmholtz coil that is at rest within a
frame of reference that is approaching the proton from the left side of the
page with a velocity to the right, is there still a force on the proton
toward the top of the page?