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Q.

If the angles of dip at two places are 30 and 45° respectively, then the ratio of horizontal components of earth's magnetic field at the two places assuming magnitude of total magnetic field of earth is same will be

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a

3:2

b

1:3

c

1:2

d

1 : 2

answer is A.

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Detailed Solution

The horizontal components areBH1=Bcosϕ1 and BH2=Bcosϕ2∴   BH1BH2=cosφ1cosφ2=cos30cos45=32×2=32
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