Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

At point A on the earth's surface, the angle of dip is, $\delta=+25^\circ$ . At a point B on the earth's surface, the angle of dip is, $\delta=-25^\circ$ . We can interpret that:

A and B are both located in the southern hemisphere.

A and B are both located in the northern hemisphere.

A is located in the southern hemisphere and B is located in the northern hemisphere.

A is located in the northern hemisphere and B is located in the southern hemisphere.

Step-by-Step Solution

Definition: The angle of dip (or magnetic inclination, $\delta$ ) is the angle that the total magnetic field vector of the Earth makes with the horizontal direction at any point on the surface.
Field Direction: The Earth's magnetic field lines emerge from the magnetic South Pole (near the geographic South) and enter the magnetic North Pole (near the geographic North). Thus, the field lines point roughly from South to North .
Sign Convention:

In the Northern Hemisphere, the magnetic field lines point downwards towards the Earth's surface. A dip needle's north pole dips down. By convention, the angle of dip is considered positive ( $0 < \delta \le 90^\circ$ ).
In the Southern Hemisphere, the magnetic field lines point upwards away from the Earth's surface. A dip needle's north pole points up. By convention, the angle of dip is considered negative ( $-90^\circ \le \delta < 0$ ).

Analysis:

Point A has $\delta = +25^\circ$ , which implies it is in the Northern Hemisphere.
Point B has $\delta = -25^\circ$ , which implies it is in the Southern Hemisphere.

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