Answer the following question regarding earth’s magnetism:

A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field.

The three independent quantities used to specify the earth’s magnetic field are the following.

1) Magnetic declination: It is the angle between the geographic north and the magnetic north at a place.

2) Angle of Dip: It is the angle between the horizontal plane and the magnetic axis, as observed in the compass.

3) Horizontal component of earth’s magnetic field

Note: If the compass deflects right of geographic north, then declination is positive and if deflection is towards the left of geographic north then it is negative declination