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Unformatted text preview: into the page where the charge is (remember the current is to the left) and of magnitude so the force on the charge is of magnitude and is directed away from the wire, so the charge will accelerate away from the wire. Now let us examine the same physical system in the frame of reference in which the charge is initially at rest. In that frame, the electrons are also at rest, but the positive background charge is flowing at v : What force does q feel in this frame ? Since q is at rest, it cannot feel a magnetic force: such forces depend linearly on speed! Yet it looks as if it cant feel an electric force either, because the positive and negative charges in the wire have equal densities, right? This leads to the conclusion that q feels no force at all in this frame, so it wont accelerate away from the wire, as it did in the other frame. This is of course nonsenseso where did we go wrong?...
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