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"My favorite demonstration of Lenz's law is the "jumping
ring" demo.
http://www.rpi.edu/dept/phys/Dept2/physlabsite/demoFaradayjumpingring.htm
Advantages include
-- There is no doubt that it demonstrates Lenz's law,
namely it verifies the /sign/ of the induced current.
The sign is such that the ring moves /away/ from the
high-field region.
-- All the important parts are out where you can see
them."