Question

Horizontal component of the earth's field is 3×105T and of dip is 53o. Magnetic field of the earth at that place is

A
25×105T
B
5×105T
C
85×1010T
D
9.9×108T
Solution
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The correct option is B 5×105T
Horizontal component of the earths magnetic fields is given by
BH=Bcosδ
B=BHcosδ=3×105cos53o
=5×105T

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