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A dip needle lies initially in the magne...

A dip needle lies initially in the magnetic merdian when it shows an angle of dip `theta` at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip `theta^(')`. Then `tantheta^(')/tantheta` is

A

`cos alpha `

B

`1//sin alpha `

C

`1//tan alpha `

D

`1//cos alpha `

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The correct Answer is:
D
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