To my own observation, every object has a main particle in the very center. Change the direction of that main particle magnetic pole and it will cause a chain reaction to the rest. That object will then push against the pole of the earth or gravity. I also think that this will only be temporary then the main particle pole will switch back creating the object to return to its original pole.

 

Changing the pole of an object will have to be used by the opposite flow of electricity.

 

 

 

 

Magnetism and gravity are distinct kinds of interactions. Changing the magnetic properties of something will not create antigravity. It can't, since gravity isn't a magnetic effect.