How can the angle of dip be determined without placing the dip circle in the plane of magnetic meridian?

At a certain location in Africa, a compass points 12^@ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points 60^@ above the horizontal. The horizontal component of the earth’s field is measured to be 0.16 G. Specify the direction and magnitude of the earth’s field at the location.

Explain the terms magnetic Dip

Angle of dip is 90^@ at

The angle of dip at the magnetic equator is

The true value of dip at a place is 45^@ If the plane of the dip circle is turned through 60^@ from the magnetic meridian, what will be the apparaent value of the dip?

Define the terms angle of dip. Derive the relation between angle of dip and the resultant magnetic field of earth at a place.