So don't be surprised if it's crap.In fact I know it's crap,I just need proper physics people to confirm it's crapness. Think of a hollow cylinder.There are springs on the bottom and top surfaces of the cylinder,meaning that if a ball was inside it would bounce back and forth.It is filled with oil(assume no air bubbles),and the springs are charged.One is positive,one negative.A metallic/magnertic(not sure myself on the material,you choose! ) sphere is in the cylinder.It is charged, pos/neg and so is repelled by one spring and attracted by the other.Actually when I say 'spring' might be a set of springs.Anyway,supposedly the upthrust of the oil will make up for the gravitaional effects on the sphere,and the sphere will be always on the move up and down.Wind a coil around the cylinder and you are producing an induced current. OK that was the theory-now please take it easy.I know you're probably pissed off with a lot of ridiculous/silly things here.... I look forward to have you physics people explain to me all the reasons why this wouldn't work.