I have a question regarding Magnetic Fields

[Noobula]

If you were to take a superheated iron ball (say a heavily scaled down version of the Earth's core) and set it in motion inside of a heated and ultra-pressurized plasma globe with another light hard coating ontop of it also set in motion, would that generate a magnetic field similar in shape to Earth's if it was done in a vacuum? I'm trying to think of something similar to this that generates a magnetic field...I kind of have the vision of a ball being kept heated by the pressure and the heat of plasma (or magma in a literal sense) with another shell outside of it keeping it all together under pressure so that the ball stays equal in the center. This is not a homework question, its just for my own curiosity about magnetic fields (shape, size, generation).

I'm fairly new to astronomy so be gentle.

 

[genneth]

http://en.wikipedia.org/wiki/Dynamo_Theory

 

[Noobula]

Looks cool, thanks for the info.