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Diamagnetism
Presenter: Tony Wayne, Albemarle High School, twayne[at symbol]k12albemarle.org
Va. SOL:
PH.12 The student will investigate and understand how to use the field concept to describe the effects of gravitational, electric, and magnetic forces. Key concepts include
National Standards:
none
Topic/Concept
This is an example of diamagnetism. Diamagnetism is a property where a material repels all magnetic fields.
Materials
Safety Considerations
The hot glue is in excess of 135° F. It will burn. Keep all materials out of yours or anybody else’s mouth. Look both ways before crossing the street.
Presentation
Hang the popsicle sticks with bismuth attached to the ends from a none magnetic stand. I use a small screw placed in the bottom of a hanging wall cabinet. Hold a magnet to the bismuth and watch it move. (I use this as one of several magnetism stations.)
How the physics is demonstrated
There are three kinds of magnetism. paramagnetism, ferromagnetism and diamagnetism. Paramagnetism is a property where a material exhibits magnetic properties only in the presence of an external magnetic field. Aluminum is one of these materials. Ferromagnetism is a material that retains its magnetic properties after a magnetic field has been removed. Cobalt, iron and nickel are examples of ferromagnetic materials. Diamagnetic materials repel ALL magnetic fields. Water and bismuth are diamagnetic.
Construction and Tips Regarding the Demonstration
Glue the popsicle sticks together with hot glue. Glue the bismuth onto the ends with the hot glue. Try to balance the sticks and bismuth. Attach a string to the ends so you can hang the set up.
Sources & References
http://en.wikipedia.org/wiki/Ferromagnetism
http://en.wikipedia.org/wiki/Parramagnetism
http://en.wikipedia.org/wiki/Diamagnetism
http://sci-toys.com/scitoys/scitoys/magnets/pyrolytic_graphite.html
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