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# Horizontal component of the earth's field is 3×10−5T and of dip is 53o. Magnetic field of the earth at that place is25×10−5T5×10−5T85×1010T9.9×10−8T

A
85×1010T
B
25×105T
C
5×105T
D
9.9×108T
Solution
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#### The correct option is B5×10−5THorizontal component of the earths magnetic fields is given byBH=Bcosδ⇒B=BHcosδ=3×10−5cos53o=5×10−5T

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