. The magnetic field at any point is the combined effect of the magnetic field due to the current in the wire and the magnetic field of the Earth. Iron filings when placed near the wire carrying current are arranged in circles due to the magnetic field produced by the current flowing through the wire. However, at the point far away from the wire, the magnetic field due to the earth is predominant as compared to the magnetic field due to current due to which the iron filings are arranged in straight lines. The point where the two fields are equal and opposite is called the neutral point. At the neutral point, the net magnetic field is zero and the compass needle at this point rests in any direction.
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You just say that the magnetic is a very good material but it is a bad conductor of heat
it's have copper and very big amount of Iron .
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