Question

At acertain location in Africa, a compass points 12º west of thegeographic north. The north tip of the magnetic needle of a dipcircle placed in the plane of magnetic meridian points 60º abovethe horizontal. The horizontal component of the earth’s fieldis measured to be 0.16 G. Specify the direction and magnitude of theearth’s field at the location.

Answer 1

Angleof declination,θ = 12°

Angleof dip,

Horizontalcomponent of earth’s magnetic field, B_H= 0.16 G

Earth’smagnetic field at the given location = B

Wecan relate Band B_Has:

Earth’smagnetic field lies in the vertical plane, 12°West of the geographic meridian, making an angle of 60°(upward) with the horizontal direction. Its magnitude is 0.32 G.