Q.

The angle of dip at a place is 60o. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is

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a

1.28 units

b

0.64 units

c

0.16 units

d

0.32 units

answer is D.

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Detailed Solution

BH=Bcosϕ= 0.64 x cos60o = 0.64 x 12 = 0.32 units
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The angle of dip at a place is 60o. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is