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• Topic:

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A dip needle lies initially in the magnetic meridian 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 $\theta \text{'}$ . Then  is

(a) 1/cos x

(b) 1/sin x

(c) 1/tan x

(d) cos x