how much and where are the pole of electro magnet

Dear student,

An electromagnet is simply a coil of wire.  It is usually wound around an iron core.  However, it could be wound around an air core, in which case it is called a solenoid.  When connected to a DC voltage or current source, the electromagnet becomes energized, creating a magnetic field just like a permanent magnet. It will have north pole and south pole. The field of lines emerge from is the north pole.

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Hope this helps,

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