Q.

The value of the horizontal component of the earth's magnetic field and angle of dip are 1.8 x 10-5 Wb/m2 and 30o, respectively, at some place. The total intensity of earth's magnetic field at that place will be

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a

5.0 x 10-5 Wb/m2

b

3.18 x 10-5 Wb/m2

c

2.08 x 10-5 Wb/m2

d

3.67 x 10-5 Wb/m2

answer is A.

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Detailed Solution

Horizontal component, BH=B cosϕ

Total intensity of earth magnetic field, B=BHcosϕ

=1.8 x 10-5cos30o=1.8 x 10-53/2=2.08 x 10-5 Wb/m2

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