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Question
A compass needle, free to turn in a vertical plane orients itself with its axis vertical at a certain place on the earth. Find out the values of (i) horizontal component of earth's magnetic field and (ii) angle of dip at the place.
Solution
i) As, Horizontal component of earth’s magnetic field, BH = B cosδ
Putting δ = 900
∴ BH = 0
(ii) For a compass needle align vertical at a certain place, angle of dip,
δ = 900.
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