Q.

A dip circle lies initially in the magnetic meridian. If it is now rotated through angle θ in the horizontal plane, then tangent of the angle of dip is changed in the ratio

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a

1 : cos θ

b

cos θ : 1

c

1 : sin θ

d

sin θ : 1

answer is A.

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Detailed Solution

Here, tanδ=BVBH and tanδ'=BVBH cos θ∴tan δ'tan δ=BVBH cos θ x BHBV =1cos θ
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A dip circle lies initially in the magnetic meridian. If it is now rotated through angle θ in the horizontal plane, then tangent of the angle of dip is changed in the ratio