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A dip circle is adjusted so that its needle is free to move in the magnetic meridian, and the angle of dip at that place is 40°. The instrument is then turned so that the plane of the needle makes an angle of 30° with the magnetic meridian. In this new position, the needle will dip by an angle of

1. 40°
2. 30°
3. greater than 40°
4. less than 40°

Correct answer: greater than 40°

Solution

When the plane makes angle 30 deg with the meridian, tan(dip') = tan(40)/cos(30) > tan(40), so the apparent dip is greater than 40 degrees.

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