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State two evidences of the existence of ...

State two evidences of the existence of earth's magnetic field.

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The existence of the earth.s magnetic field is based an the following facts:
1. A freely suspended magnetic needles always rests in geographic north-south directions.
2. An iron rod buried inside the earth along north south direction becomes a magnet.
3. Neutral points are obtained on plotting the field lines of a magnet where the net magnetic field is zero.
4. A magnetic needle rests with its geometric axis making different angles with horizontal when suspended at different places on the earth.
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