Write the three ways to produce magnetic fields.

Three different ways of producing magnetic fields are 1) A loop or solenoid carrying current. 2) A magnetic bar, round magnet or horse-shoe magnet. 3) A coil which carries current.

A coil with many circular close turns of insulated copper wire is a solenoid. One end of such a solenoid behaves like the north pole and the other as a south pole.

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