Re: jumping ring demo

[Doug Craigen <dcc@CYBERSPC.MB.CA>]

> When current begins to flow in the coil its  magnetic field strengthens.
> This increasing of a magnetic field is the change which is  opposed by the
> ring.  The current in the ring flows so as to set up its own field to oppose
> the change.  Therefore, you have two similar poles facing one another and a
> repulsive force.  The ring jumps up.

This explains how you get a magnet (the ring) in an external field where
it is oriented opposite to the direction of the field lines.  This does
not cause repulsion, this causes rotation.  Dipoles do not accelerate
due to constant fields, only rotate.  For there to be a translating
force, there must be a gradient in the external field (which of course
there is in this case).

()-()-()-()-()-()-()-()-()-()-()-()-()-()-()-()

Doug Craigen
          Latest Project - the Physics E-source
          http://www.dctech.com/physics/