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What is the proof of earth's magnetism?...

What is the proof of earth's magnetism?

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It is based on the following evidences:
(i) A magnet suspended from a thread and free to rotate in a horizontal plane comes to rest along the north-south direction.
(ii) When a soft iron piece is buries under the earth in the north-south direction, it is found to acquire the properties of a magnet after some time.
(iii) When we plot magnetic field lines of a magnet, neutral points are obtained.
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