So I asked my professor this question the other day, but I didn't get a clear answer. He said something about the fields being relative to each other, and so they didn't interact. Anyways, here is the setup: Suppose we have a circular conducting plate of some radius, and on this plate there are two free charges with the same value of charge, (q1=q2). Where then, would the charges be? because the charges repel each other, it is a fair guess that they would be on the edge of the plate, where the distance between them is greatest. Suppose then, that the plate is moving with a constant velocity. Where would the charges be then? My guess is that because each moving charge creates a magnetic field, the force of one charge's magnetic field on the other charge is q(VXB) which always points inward toward the axis the plate moves along. Perhaps a clearer explanation: As the plate moves along an axis, one charge lies along the leading edge of the plate, and the other along the trailing end of the plate, and a line between the two charges coincides with the axis the plate moves along. I've drawn a picture if it helps. Is this correct? as I mentioned at first, I didn't get a clear answer from my professor. He said something about relative fields and them not interacting, but I couldn't follow what he was saying. Any thoughts?