Stephen A. Lawrence wrote: > The thing you need to keep firmly in mind is that all motions considered > here are as seen by an observer stationary in the "laboratory frame" and > in that frame the motion of the charges is not simple rotation about the > ring's axis; it's got a translation added to it. The charges are > following something more akin to a cycloidal path than a circular path. > > Here's a picture which may help; the red line, motion of the charges, is > supposed to be the sum of the green line (translation) and the black > curve (rotational velocity) (ok ok the lines are not drawn not to scale, > sorry): > > http://www.physicsinsights.net/images/moving-ring.png > > The B field is assumed to point UP through the page, so the Lorentz > force lies in the page and is perpendicular to the net motion of the > charges.
So with your model the ring would not slow down if the box with the dipole field moved instead of the ring? George Holz Varitronics Systems
