At a point A on the earth’s surface the angle of dip, δ = +25°. At a point B on the earth’s surface the angle of dip, δ = –25°. We can interpret that:
(1) A and B are both located in the northern hemisphere.
(2) A is located in the southern hemisphere and B is located in the northern hemisphere.
(3) A is located in the northern hemisphere and B is located in the southern hemisphere.
(4) A and B are both located in the southern hemisphere
Answer: Point A is located in the Northern hemisphere and point B is located in the southern hemisphere.
Explanation: basically, angle of dip is the angle made by resultant earth's magnetic field from horizontal.
here, at point A on the earth's surface, the angle of dip is +25° (i.e., positive) so, point A is located in the Northern hemisphere and point B on the earth's surface, angle of dip is -25° (i.e., negative) so, point B is located in the southern hemisphere.