a compass needle free to turn in vertical plane orients itself with its axis vertical at a certain place on earth. find 1) horizontal component of earths magnetic field 2) angle of dip at a place.
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The place is clearly the magnetic pole of earth as needle rotates in vertical plane and, not in horizontal plane we have, BH = 0 . Hence, (a) Horizontal component of earth's magnetic field at the magnetic poles, BH = 0 .
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