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Question

Define angle of inclination (magnetic declination).
In the magnetic meridian of a certain place, the horizontal component of earth's magnetic field is 0.25 gauss and the dip angle is 60o. At this place find the value of earth's magnetic field.

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Solution

Magnetic declination is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).

Since the dip angle at the place is 60, the horizontal component of earth's magnetic field BH and the earth's magnetic field B are related as BH=Bcosθ
B=BHcosθ
=0.25cos60gauss
=0.5gauss

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