Why is the magnetic field induced by an electric current in a straight wire in the form of concentric circles around the wire?
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The “why” of the right hand rule requires us to know why the universe was created the way it was, why quarks are quarks etc, a level of knowledge we cannot answer. We only observe.
For more explanation of Fleming’s right-hand rule, and the laws that electromagnetism and charges seem to obey:
https://en.wikipedia.org/wiki/Faraday%27s_law_of_induction
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