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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Magnetism and electricity are both a part of electromagnetism. It is one of the four fundamental forces in the universe, the others are gravity, weak force, and strong force. The weak and strong force is important for the interaction between particles in the atomic nucleus and for the quarks in the protons and neutrons themself.
We do not know of a lower-level explanation for electromagnetism, there might not be one. So the best explanation we have is that is how electromagnetism works. It might be impossible to explain why it works that way in our universe.
So the best answer we have is that is how the universe works.
Physics is about asking how it happens not why it happens, Even if we have a lower-level explanation that can be in multiple levels it will always end up as that is how the universe works.
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