5.1(a). Answer the following questions 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.

Answers (1)

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

(i) The horizontal component of Earth's magnetic field  (H_{E}).

(ii) The magnetic declination (D): It is the angle between the geographic north and the magnetic north at a place.

(iii)The magnetic dip (I): It is the angle between the horizontal plane and the magnetic axis, as observed in the compass

 

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