المجال المغناطيسي للأرض

Visitor Experience
Visitors see a globe in the centre of a case filled with iron dust.
They are encouraged to scatter the iron dust on top of the globe.
Because of the magnet placed inside, the iron sticks on the north
and the south pole.
Background
All magnetic objects produce invisible lines of force that extend
between the poles of the object. An easy way to visualize this is
to spread iron filings on a sheet of paper and place a bar
magnet under the paper. The iron filings will arrange themselves
around the magnet and along the magnetic field lines. In the
simplest terms, Earth can be thought of as a dipole (2-pole)
magnet. Magnetic field lines radiate between Earth’s north and
south magnetic poles just as they do between the poles of a bar
magnet. Charged particles become trapped on these field lines
(just as the iron filings are trapped), forming the magnetosphere.