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 and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.