Hey guys. This is a first post so please give me tips on how to make it better. Anyway, the problem that I am doing stated by the International Young Physicists Tournament is: Electro-oscillator A mass is hung from the middle of a horizontal wire. When a current is passed through the wire, the mass may start to oscillate. Describe and explain this phenomenon. I have researched all over the net and consulted everyone that I know and we have done the experiment and found that it does actually oscillate quite considerably. Our testing rig is two retort stands about 1.4m away from each other, strung up between them is a hair-width copper wire with a thin plastic coating. We then hung a small copper weight (15g) in the middle. We then attached the two ends of the copper wire to a 6v AC power box via alligator clips and let the weight stop swing. When we then turned it on and it sagged about 1.5cm and started to oscillate up and down about 2mm. I have chased every avenue of information but unfortunately, I am stuck for a theory. We actually have a couple ideas but with no high end knowledge of the theorem behind them we can't explain them to great enough detail. Equations to support the idea is not necessary as the review process is more like a debate were we are pitted against other year 11 students. I also hate complex equations!:surprised One of our ideas that we have came up with is that because AC current in Australia is around about 50Hz, the wire is heating up and cooling down at 50Hz allowing the wire to shift the weight in the centre up and down and then the momentum of the weight and the wire create a noticeable oscillation of both weight and wire. Once again, we have NO access to anyone who specialises in any of the resulting fields. Another idea is that magnetism is involved in some way, due to the right hand coil of magnetism. We think that the wire may be drawn into a spiral pattern by its own magnetic field causing it to want to rotate. Because of gravity, it will happily travel down but become tensioned and spring back up and then it is drawn out again and the process repeats. Any help, ANY AT ALL! Any ideas or websites that may help and please use plain English as I'm only just starting secondary physics and I wouldn't have expected this until Universty so yeah. Anyway. Thanks for reading and please help.... Callum G I will post a picture of the rig and possibly a rig showing the phemonena.