State and explain four evidences to show the existence of earth’s magnetic field.
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Two evidences of existence of earth's magnetic field:
(i) A freely suspended magnetic needle always rests in geographic north-south direction.
(ii) Neutral points are obtained on plotting the field lines of a magnet.
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- (i) A freely suspended magnetic needle always rests in geographic north-south direction.
- (ii) Neutral points are obtained on plotting the field lines of a magnet.
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