This is a commonly used apparatus to demonstrate Lenz’s law. It features a copper tube with two metal weights inside (one includes a magnet, and one doesn’t). Excellent demonstration tool for use in the science classroom for lessons on electromagnet circuits.
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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

Science so good, it's like magic