The shape of the Earth's magnetic field is approximately that of a
A) monopole,as would be produced by just one pole of a magnet.
B) dipole,such as that produced by a bar magnet.
C) torus,a doughnut-shaped ring parallel to the Earth's equator.
D) sphere,following the shape of the Earth.

Question

Quizplus · Accepted Answer

The Earth's magnetic field is approximately that of a dipole, which means that it has two poles, a North and a South pole, similar to a bar magnet. The magnetic field lines originate at the North pole, loop around in space, and terminate at the South pole. This dipole shape can be explained by the movement of molten iron in the Earth's outer core, which generates electric currents that create the magnetic field. While the Earth's magnetic field is not a perfect dipole, this is the closest approximation.

The Shape of the Earth's Magnetic Field Is Approximately That