JAMB Physics 2023 Paper

Concept:Angle of dip is the angle Earth’s total magnetic field makes with the horizontal.Explanation:At the magnetic equator, the magnetic field is horizontal.So the angle of dip is $0^\circ$ there.At the magnetic poles, the field is vertical.So the angle of dip is $90^\circ$ there.Therefore, the dip changes from $0^\circ$ to $90^\circ$ between the equator and the magnetic poles.It is not constant, and it does not depend mainly on altitude.Its sign convention depends on hemisphere, but the key correct statement is about equator and poles.Answer:Option A is correct.