If the angles of dip at two places are 30o and 45o respectively, then the ratio of horizontal components of earth's magnetic field at the two places will be
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a
3 : 2
b
1 : 2
c
1 : 3
d
1 : 2
answer is A.
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Detailed Solution
The horizontal components are BH1=B cosϕ1 and BH2=B cosϕ2∴BH1BH2= cosϕ1cosϕ2=cos30ocos45o=32 x 2=32