{"product_id":"lenzs-law-demonstration-tube-magnetic-braking-in-a-copper-tube","title":"Lenz's Law Demonstration Tube — Magnetic Braking in a Copper Tube","description":"\u003cp\u003eDrop a magnet through a copper tube. Watch it fall in slow motion — stopped by a force with no moving parts.\u003c\/p\u003e\u003cp\u003eThis is Lenz's law in its purest form. As the magnet falls through the non-magnetic copper tube, it induces eddy currents that create an opposing magnetic field — slowing the magnet to a fraction of gravitational speed. There is no friction, no mechanism, just electromagnetic induction acting at a distance through the metal wall.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat you can demonstrate:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFaraday's law of electromagnetic induction\u003c\/li\u003e\n\u003cli\u003eLenz's law — induced currents oppose their cause\u003c\/li\u003e\n\u003cli\u003eEddy currents in conductors\u003c\/li\u003e\n\u003cli\u003eThe connection between changing magnetic flux and electric current\u003c\/li\u003e\n\u003cli\u003eWhy MRI machines use superconducting coils to maintain field stability\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e Thick-wall copper tube (30cm) · Matched neodymium magnet (same diameter as tube bore) · Identical steel slug for comparison · Stand\u003c\/p\u003e\u003cp\u003eDrop both at once: the steel slug falls instantly; the magnet floats down in 10 seconds. The room always goes quiet.\u003c\/p\u003e","brand":"Golden Physics Project","offers":[{"title":"Default Title","offer_id":54140237283620,"sku":"GPP-LENZ-TUBE","price":44.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2879\/9524\/files\/P8-8400Lenz_sLawApparatus2048x2048.jpg?v=1780680395","url":"https:\/\/shop.goldenphysics.org\/products\/lenzs-law-demonstration-tube-magnetic-braking-in-a-copper-tube","provider":"Golden Physics Project","version":"1.0","type":"link"}