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A dip needle lies initially in the magnetic meridian when it shows an angle of dip θ at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip θ'. Then tanθ'tanθ is

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a

1cosx

b

1sinx

c

1tanx

d

cosx

answer is A.

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Detailed Solution

In first case,tanθ=BVBH .......(i)In second case, tanθ'=BVBH cosx .......(ii)From equations (i) and (ii), tanθ'tanθ=1cosx

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