Let the magnetic field on earth be modellel by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator.

The magnetic field of Earth can be modelled by that of a point dipole placed at the centre of the Earth. The dipole axis makes an angle of 11.3^@ with the axis of Earth. At Mumbai, declination is nearly can zero. Then,

At magnetic poles the angle of dip is

The angle of dip at the magnetic equator is

The earth's magnetic field may be considered to be due to a short magnet placed at the centre of the earth and oriented along the magnetic south-north direction. the ratio of the magnitude of the magnetic field on the earth's surface of magnetic equator to that at the magnetic poles

Explain the terms the magnetic field due to earth at a point.

What is the expected value of dip at magnetic poles of the earth?