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At a certain location in Africa, a compass points west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be Specify the direction and magnitude of the earth’s field at the location.

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Ans: In the above question it is given that:
Angle of declination,
Angle of dip,
Horizontal component of earth’s magnetic field,
Earth’s magnetic field at the given location
We can relate and as:

   

Earth’s magnetic field lies in the vertical plane, West of the geographic meridian, making an angle of (upward) with the horizontal direction. Its magnitude is .