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Doubt & Answer Explanation

Doubt

according to a book, “earth’s magnetic field is uniform only for a short region of space “

Since the magnetic field of earth determines the geographical south and north direction.

If earth’s magnetic field is not uniform then the magnet cannot determine the correct geographical north and south direction.

Sir please clarify the above statement

Answer Explanation

earth magnetic field is same as bar magnet on the rotational axis of the earth. and the magnetic field of bar magnet is uniform only in the bar magnet ( at the centre).,

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