physicsismylife

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Magnetism is caused by moving electric charges. It is just a fact of life that opposite charges attract and similar charges repel. There are various ways of describing this mathematically, but they don't really say "why" it happens.

Not really. Magnetism is created by alignment of magnetic polarities. In the case of subatomic particles, the source of whole magnetism, is the quantum spin. Charged particles are being aligned by electric currents - and this is why, they create a magnetic field. But EM induction works as well in the opposite way: a pernament magnet can create an electric current, when it moves around a conductor. Electric charge and the quantum spin are two, separate properties of matter...

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Magentic fields do not push by themselves.

There's no kinetic force, which would work on itself. Every kind of field remains static, until we won't disturb it's balance of energy. Energy remains stored in matter in the form of potential kinetic force, which this matter can induce on other matter. To turn a potential field into kinetic one, we need to introduce somekind of test mass

Maybe insted of "solid", we should use in this case the term "static" or "potential"?

I've tried to explain the source of magnetism and it's mechanics in one of my movies:

I hope, that it will help you to understand the magnetic fields...

Let's begin this thread with an excercise. If you think, that you're good at calculating things, I have an interesting problem to solve. I would like you, to use the basic rules of General Relativity - Einstein's field equations, combined with interior and exterior Schwarzschild solutions - to describe the gravitational field as an embedding diagram. Here is the basic knowledge, regarding the given problem:

https://en.wikipedia.org/wiki/Introduction_to_general_relativity#From_acceleration_to_geometry

https://en.wikipedia.org/wiki/Interior_Schwarzschild_metric

Here is an example, how to make such diagram for the Sun and Earth:
http://www.johnstonsarchive.net/relativity/stcurve.pdf
Try to use this knowledge, to define the gravitational field of an empty spherical shell with mass M (interior and exterior fields) - and compare the results with Newton's theorem...

Next step will be to change the interior of spherical shell and turn it into uniform distribution of matter - which can be treated as a liquid medium.
Now, you should include those two properties of liquids:

Hydrostatic pressure:
https://en.wikipedia.org/wiki/Hydrostatics

Surface tension:
https://en.wikipedia.org/wiki/Surface_tension

If you are rally good at calculating things, you should end up with a solution, which should be capable to properly explain those two scenarios:

If you will succeed, I will give you 40% of credit - so it's possible, that you can be quite famous

But in the meantime, I will keep explaining the subject of gravity and fluid dynamics, in my own way. My goal is to see, if the calculations will match my predictions...

3... 2... 1... Go!
Good luck!