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Q.

A dip needle arranged to move freely in the magnetic meridian dips by an angle θ. If the vertical plane in which the needle moves is rotated through an angle α to the magnetic meridian than the needle will dip by an angle.

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a

More than θ

b

θ

c

α

d

Less than θ

answer is C.

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Detailed Solution

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 Where dip circle is set at on angle α to the magnetic meridian 

δ′ is the apparent dip

δ is actual dip

tan⁡δ=BvBHtan⁡δ'=BvBHcos⁡α

In this case;

cos⁡α<1

So, the apparent dip is less than the actual dip.

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