Q. 1 A4.0( 18 Votes )

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.

Answer :

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.

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 a negative declination

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

3) The horizontal component of the earth’s magnetic field

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