Define the following using suitable diagrams : (i) = magnetic declination and (ii) angle of dip. In what direction will a compass needle point when kept at the (i) poles and (ii) equator ?
(i) Magnetic declination : Angle between the magnetic axis and geographical axis.
Alternatively : Angle between magnetic meridian and geographical meridian.
(ii) Angle of dip : It is the angle which the magnetic needle makes with the horizontal in the magnetic meridian.
Alternatively : The angle which the total magnetic field of the earth makes with the surface of the earth.
The direction of compass needle is vertical to the earth’s surface at poles and is parallel to the earth’s surface at equator.