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