Take something like a drill.
I understand its electric, I understand that in some way the electricity makes sothing move and then that movement is turned into spinning through gears and engineering magic.
But where does the initial movement come from? All i can picture is something is spinning or rotating because something else is rotating. But it has to start somewhere right?
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While i think many of the explanations here are reasonable, you wanted to know where the rotating _starts_, and none of these would explain why a homopolar motor spins.
It comes down to the forces exerted against the magnetic field by the flowing of electric current in the wires that make up the motor, this force can be understood through the “right hand rule” which explains that a force is generated tangental to flowing current and its magnetic field and even helps you understand which way rotation will start.
[https://en.wikipedia.org/wiki/Homopolar_motor](https://en.wikipedia.org/wiki/Homopolar_motor)
[https://en.wikipedia.org/wiki/Right-hand_rule](https://en.wikipedia.org/wiki/Right-hand_rule)
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