why does rotation on electrons in a circular coil create a magnetic field
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Fundamentally any current carrying wire produces magnetic field around it. This was first observed by Hans Christian Oersted in 1820. These field lines are concentric circles around the wire with decreasing intensity as we move away from wire.
If this wire is bent circular coil, the magnetic field lines produced from every point on loop leads to field similar to bar magnet with north and south pole.
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