Editing Magnetic Field Viewer (section)

== Demonstration ==

# Set out the Magnetic Field Viewer and two magnets. Let students come up and slide one of the magnets inside the magnetic field viewer. What do they see happen to the suspended iron filings?
# Ask students some questions before providing an explanation. Possible questions are:
#* What causes the iron filings to line up?
#* Why don't the iron filings clump together where the magnet is at?
#* Why does the effect go away when the magnet is removed?
#* What do they think it would look like if you put two magnets in that are attracted to each other, or have opposite poles aimed towards each other? Test it, and compare the findings to the hypothesis.
#* What do they think it would look like if you put two magnets in that are repelled by each other, or have like poles aimed towards each other? Test it, and compare the findings to the hypothesis.