How does current creates a magnetic field
In: Physics
We don’t really know ‘how’. It is simply a fact that electrons are coupled to the electromagnetic field, generating an electric field by their presence and a magnetic field by their motion. We have no deeper physical principles, we simply call this coupling a “charge” and call it a day.
It’s a basic property of the universe. Every charge creates an electrical field. Every moving charge creates a magnetic field.
If you involve einsteins relativity you can find out that both electrical and magnetic field are just different viewpoints on the same thing (If a charge moves or not depends on the observer) wich is why we called it the “electromagnetic force” wich is one of the 4 fundamental forces (and later got unified with the weak nuclear force too)
The other comments do a good job at explaining the process. And they are right about it not having a reason. The electric and magnetic field are one the EM field. And the two properties of electromagnetism is electricity and magnetism. They can create each other. Why? Because. When you study the fundamental laws of the universe you quickly run into things that just work as they do for no good reason.
Electrons have north and south poles; when they are flowing we call it current. While they are flowing all the electrons line up their north and south poles together so their poles line up and create a magnetic field. Once the electrons stop flowing they start moving in random directions and their poles are no longer lined up which causes the field to collapse.
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