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Materials

bar magnet
2 sheets of notebook paper
iron filings, as found in magnetic disguise games
drinking straw

Procedure

• Cover the magnet with one sheet of paper.
• Fold the second sheet of paper and sprinkle iron filings in the fold.
• Hold the paper about 6 in. (15 cm) from the magnet.
• Blow through the straw.
• Direct the stream of air at the iron filings in the folded paper. A stream of iron filings are blown
toward the magnet.

Results

Particles of iron stick to the paper in the shape of the underlying magnet.

Why?

Around the magnet is a magnetic force field that attracts the iron filings. The Earth has a magnetic force
field surrounding it. The area affected by the magnetic field is called the magnetosphere. The
magnetosphere deflects and traps charged particles from the Sun, much as the magnet under the paper
attracted the iron filings. The charged particles come from the Sun as a result of solar flares and
sunspots. These moving particles are called solar winds and reach the Earth’s orbit at speeds up to 1 to 2
million miles/hr (1.6 to 3.2 million km/hr). Astronauts in space could be in danger from solar flare
particles because the high-energy particles damage living tissue. Without the Earth’s magnetosphere,
living organisms on the Earth would be in danger from the charged particles.