To answer the second question, you must also think about energy. Magnetism is a form of energy. It’s why magnets seem so durable and they behave so amazingly. But they aren’t an energy. They are a form of heat. If you want an example of how an energy is defined, think about this: The light that travels through a window is not an energy. The light is energy. The light itself has no energy because it is a form of energy. You don’t see the light as “energy” because the light is not an energy. The only way that energy is defined is when we can think of it as a property of that light. The same goes for magnets. The only way that the magnet might be considered an energy is if you understand that when you hold a magnet, there is an energy that is going on within the magnet, but that is not an energy as defined by any definition that you know.
Let’s take a few more examples:
A magnetic field is an energy because when the magnet is in the field and is strong enough, it can keep going. The energy of the field is what gets used to move the magnet along the field lines. A magnetic field is not an energy because there is no other energy there for it to be used for. If you have an electric field with lots of poles and a magnetic field without many poles, the field that is created by the electric field will stay exactly where it is. The electric field will move with the magnetic field. A magnetic field is not an energy because there is no other energy for it to be used for. This is why magnets don’t have an energy.
So, what is magnetic field energy?
Think about this one more moment and think about the concept of force. As a force, you can use it to push a magnet to where you want it to go. But like a magnet, force is an energy that you can’t use. It doesn’t matter how strong your magnetic field is because the magnetic field can move with the field. It doesn’t matter if it’s a magnetic field inside a magnetic field inside a magnetic field. It doesn’t matter if you put a little bit of copper wire, or an electron or something else into your magnetic field, because the magnetic field can continue to move with the current that you apply to it.
So, if the magnetic field is an energy, then the magnetic field’s energy must be an energy in some way. For that reason,