6 Crossed Electric and Magnetic Fields

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The orbits in velocity space are still circles, as in preset 5, but now with a displaced center. What are the velocity coordinates of the center of these circular orbits (NOT the green dot, but the orbit centers)?

Note the variety of cycloidal orbits in real space. (Click initialize to get the electrons back on screen.) What is the velocity of the occasional electron that moves with constant velocity in real space, with no hint of the cycloidal motion?