Angle of dip is also recognised as the magnetic dip and is defined as the angle that is made by the earth’s magnetic field lines with the horizontal.
Variation of angle of dip
The angle of dip varies from point to point by providing the information related to the movement of the earth’s magnetic field. The angle of dip is supposed to be positive when the magnetic field points downwards. When the magnetic field points upwards, the angle of dip is said to be negative. The angle of dip is 0° when the dip needle holds horizontally while the angle of dip is 90° when the dip needle rests vertically. When the horizontal component and the vertical component of the earth’s magnetic field are equal, the angle of dip is equal to 45°.
Angle of dip at the equator
Angle of dip at the equator is equal to 0° because the magnetic lines of forces are perfectly horizontal such that even the magnetic needle is horizontal there.