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Questions  

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

a
1 : cos θ
b
cos θ : 1
c
1 : sin θ
d
sin θ : 1

detailed solution

Correct option is A

Here, tanδ=BVBH and tanδ'=BVBH cos θ∴tan δ'tan δ=BVBH cos θ x BHBV =1cos θ

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The values of the apparent angles of dip in two planes at right angles to each other are 30o and 45o. Then the true value of the angle of dip at the place is 


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