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Take the y-axis to be the axis of a very long solenoid. The
current, as looked at from the negative end of the axis, circulates
clockwise, creating a uniform magnetic field inside the solenoid. A
uniform electric field inside the solenoid is directed along the positive
x-axis, |E| < |B| . It is known that such an apparatus is a velocity
selector for electrons. Tell me how to quickly argue the
direction of the velocity that is selected by this apparatus without
invoking the right-hand rule. The path of such electrons, by the way,
complete with circles, is shown in Jackson's book, 2d Ed., p. 583.