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Questions  

A magnetic needle is free to rotate in a vertical plane, which makes an angle of 600 with the magnetic meridian. If the needle stays in a direction making an angle of tan-123 with the horizontal , what would be the dip at that place? 

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a
600
b
300
c
450
d
900

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detailed solution

Correct option is B

We know the relationship between true dip and apparent dip        tanδ1=tanδcosθGiven : Apparent dip δ1=tan-123 ⇒tanδ1 = 23   True dip  δ=?                         ALso , θ=60°∴23=tanδcos60°⇒tanδ=13⇒tanδ=tan30°⇒δ=30°


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