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Q.

At two different places on earth, angle of dip are 45° and 30°. At these places the ratio of horizontal component of earth’s magnetic field is (Total earth magnetic field is same at all places on earth)

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a

23

b

32

c

23

d

24

answer is C.

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Detailed Solution

BH=Becos⁡45∘ BH′=Becos⁡30∘ BHBH′=Becos⁡45∘Be⋅cos⁡30∘=cos⁡45∘cos⁡30∘=1232=26=46=23
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