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Question

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 tanθtanθ is

A
1cosx
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B
1sinx
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C
1tanx
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D
cosx
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Solution

The correct option is A 1cosx
tanθ=BVBH;tanθ=BVBHcosx;tanθtanθ=1cosx

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