What do you know about electro-magnetism?
In the 19th century, European scientists discovered thatelectricity always makes magnetism when it moves about, or changes.
Every time an electric current flows in a wire, it generates a magnetic field all around it. Changing electric field, in short, produces magnetism. The reverse is true as well- you can make electricity using a changing magnetic field.
The first person to explain this was a Scottish physicist named James Clerk Maxwell. His theory summed all that was then known about electricity and magnetism in four relatively simple mathematical formulas. Maxwell's equations, as we now call them, combined electricity and magnetism into a single, powerful theory we call electromagnetism.
Maxwell also concluded that light itself was a form of electromagnetic wave. We now know that electro-magnetism is one of the four fundamental forces that control everything that happens in our universe.
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