Main Question or Discussion Point
Consider that we have a macroscopic, electrically charged, point object tracing out a circular path in a uniform magnetic field in the usual way due to the Lorentz force. Now we very slowly raise the overall strength of the magnetic field (slow enough that on one orbit, the object sees the same field). Will the instantaneous speed of the object increase, or will its speed stay the same and its radius of orbit decrease? Consider everything is large enough and slow enough that we can ignore relativistic effects and the object does not radiate.