According to amperes force law two parallel wires with current flowing in the same direction will experience a magnetic force attracting them together. consider two 1cm long wires parallel to each other, separated by a distance of 1cm. Pass a current through both of the wires for the time it takes for the magnetic field from each to reach half way between them, then turn the current off on the left wire. The magnetic field from the left wire from when it was still on will continue to propagate outwards towards the right wire and will pass the right wire, this will cause the right wire to attract to the left. At the same time, the magnetic field from the right wire will pass the left wire, however since the wire has no current there will be no force attracting it to the right wire. Then turn the current off on the right wire and wait till the magnetic fields dissipate. then start the process all over again very quickly. This should produce a small thrust in one direction. Is there anything wrong with this picture??