JAMB - Physics (1995 - No. 30)
At different locations on the earth's surface, the earth's magnetic field is
the same in magnitude and direction
the same in magnitude but different in direction
different in both magnitude and direction
different in magnitude but different in direction
Giải thích
The magnetic field around the earth is like that around the bar magnet.
The magnetic lines of force emerge from the geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnitude and direction at different locations on the earth's surface.