Applications - Experimental
[194] Series of experiments
Author: Florent Coulon, Besancon, France, florent.coulon@manipelec.com
Stunning and educational experiments for pupils
Mr. Coulon is a teacher at the grammar school E. Belin de Vesoul. He regularly conducts magnet experiments with his students. Some of them he captured on video. The first two videos demonstrate the strong adhesive force of our largest disc magnet.
In video 3 and 4, Mr. Coulon experimented with two large copper discs and supermagnets (disc magnet and block magnet Q-40-20-10-N); here the Faraday Induction Law can be illustrated.
Have fun watching and doing it yourself - but always wear thick gloves like Mr. Coulon!
The physical explanation for this remarkable deceleration is the Faraday Induction Law:
Dropping the magnet causes a B-field flow change in the conductor board (copper in this case). That induces circular currents in the conductor (Foucault currents, green in the graph).
The induced currents in turn produce a magnetic field, which is opposite of the falling magnet (Lenz's Law), which slows it down.
Note from the supermagnete team: Further experiments on the topic of induction can be found here.
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