What if the angular momentum of the mass acts counter to the 'angular momentum' of the charge such that the charge is held static with regard to the external environment.

The classical image of an electron is of a tiny charged ball which is spinning around the nucleus like a little solar system. If you did build such a charged spinning ball, it would create a magnetic field. This classical model can be used as a rough explanation of some effects in

magnetism and

spectroscopy. You can even model a nucleus with an odd number of protons as a spinning charged ball, and this gives some concept of

Magnetic Resonance Imaging.

Perhaps the scenario here is imagining:

You have a lump of solid material, with all the electrons spinning around their nuclei at a certain radius and identical speed. If you spin this mass at the *right *speed in the opposite direction, could you cancel the rotation of the electrons, and eliminate the magnetic field of the electron?

I imagine there is a Nobel prize waiting for anyone who could cancel the magnetic field of an electron!

However, there are some severe problems with this simplified "solar system" model of an atom when you try to compare theory and practice. For example, if you try to calculate how fast the electron is spinning around the atom, it comes out at somewhere close to the speed of light.

So in this classical model, you would need to spin the macroscopic lump of matter at

*greater *than the speed of light to cancel the sub-microscopic motion of the electron. Any real material would disintegrate long before it reached the required speed, even if Einstein hadn't told us that you can't exceed the speed of light.

In reality, all the electrons aren't all in the same orbit, they

*don't* all orbit in the same direction, and they don't orbit at the same speed. They don't all orbit in a flat plane like a solar system, but are distributed in 3 dimensions to produce the various 3D shapes of molecules. So there is no single axis and direction and speed that you could spin a macroscopic lump of matter to cancel the motion of the constituent electrons. (The solar-system model also produces false predictions like "the electron should spiral into the nucleus, emitting a blaze of radiation" - see

separate thread.)

To get a more accurate model of an atom, electron or nucleus, you need to include quantum effects, which say that the electron is not a point particle orbiting around the nucleus, but a wave function which is distributed in orbitals around the atom, with quantized angular momentum. In this model, spinning the lump of matter will have no effect on the magnetism of the electron (but linking relativity and quantum theory still leaves some gaps...)