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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This is a bit of simplified ELI20 but if you try to calculate the interaction between two moving electrons and only factor in their electrostatic forces (if they weren’t moving) and relativistic effects, after calculating everything, the resulting force is the same electrostatic force plus the magnetic force. Literally magnetic forces are a consequence of moving electricity. So the answer is kinda that the magnetic fields are concentric circles because the electrostatic force is along the radiuses of those circles, aka the math checks out, it just is that way, which was the point of the other comments.
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