PURPOSE: To indicate how nuclei attract each other if they come close enough together.
DESCRIPTION: Let the magnets snap together as you discuss how they do work and in the process become slightly less massive, as in E=mc^2. Then discuss the analogy to protons combining to form deuterium and then helium while releasing energy.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: Two small horseshoe magnets.
SETUP TIME: None.
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