Correction: If the result of the magnetic force being seen to act on one frame as expected from the flux in another leads to a dramatic and non-trivial paradox, it is going to be harder to keep up the delusion that such is possible.
If an observer in another frame expects a force to exist in the charges frame so as to match their expectation of a magnetic field, and if that would lead to a dramatic and paradoxical result as it would not be existed to occur in the static frame. A very easy real world experiment is the common practice of waving a a coil past a permanent magnet and seeing the voltage induced in the coil read on a meter. (yes this experiment is the inverse as it is relative motion to observe an electric field from relative motion to a magnetic field) To be consistent, David would have to argue that if there were a coil attached to a volt meter being waved by the permanent magnet, and another coil attached to the volt meter that is not moving relative to the magnet, that the waving coil that sees an electric field from movement relative to the magnetic field would also expect the stationary volt meter to see this voltage also, and expect it to be deflected. Now it is easy to move your head with the waving coil, if you see a voltage induced in the non moving coil when you wave your head and not when you don't, I will be very very impressed and amazed. But I think we both know that no such effect exists. And if it does not exist in the magnetic to electric, it won't exist in electric to magnetic. John On Thu, Feb 20, 2014 at 9:14 PM, John Berry <[email protected]> wrote: > On Thu, Feb 20, 2014 at 8:53 PM, H Veeder <[email protected]> wrote: > >> Dramatic! >> >> As alternate way of revealing the paradox, I imagined the two charged >> balls connected by a spring which counter balances the force of repulsion. >> In the reference frame where the balls are moving, a magnetic force would >> cause the spring to become shorter. Paradoxically, in the frame of >> reference of the balls the length of the spring would remain unchanged. >> > > I selected a more dramatic version because it could be argued that some > expansion or contraction of space would make the spring look stretched in > one frame and compressed in another. > > If the result of the magnetic force being seen to act on one frame as > expected from the flux in another leads to a dramatic and non-trivial > paradox, it is going to be harder to keep up the delusion that such is > possible. > > John >
