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Question: At a certain location in Africa, compass points 12° west of geographic north. The north tip of magne...

At a certain location in Africa, compass points 12° west of geographic north. The north tip of magnetic needle of a dip circle placed in the plane of magnetic meridian points 60° above the horizontal. The horizontal component of earth’s field is measured to be 0.16 G. The magnitude of earth’s field at the location is

A

0.32 G

B

0.42 G

C

4.2 G

D

3.2 G

Answer

0.32 G

Explanation

Solution

: Here, , T, dip angle, Then magnitude of earth’s field.

=0.32×10−4 T=0.32G= 0.32 \times 10 ^ { - 4 } \mathrm {~T} = 0.32 \mathrm { G }