| Brand | Sci-Supply |
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Check the listing for details. Lenz Law & Induction Demo. Condition: New. Listed at 18.95 USD. This is a simple and effective way to demonstrate induction & Lenz Law. In the product photo above, you have a complete closed circuit (loop) on the right. When a magnetic field is introduced (from a bar magnet being moved toward the closed loop), we have an electrical current and a magnetic field that will repel against the original magnetic field.