{"product_id":"magnetic-field-viewer-film-a4-sheet-iron-powder-suspension","title":"Magnetic Field Viewer Film — A4 Sheet, Iron Powder Suspension","description":"\u003cp\u003e\u003cstrong\u003eMagnetic field lines are invisible — until now.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA suspension of fine iron powder in a viscous fluid responds to magnetic fields exactly as Faraday first described, aligning along field lines to make the invisible geometry of magnetism instantly visible. Place any magnet beneath or above the film, watch the field lines appear. Essential for understanding dipole fields, monopole approximations, and the geometry of Maxwell's equations in a concrete, tactile way.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSize: A4 (21×29.7cm) flexible film\u003c\/li\u003e\n\u003cli\u003eIron powder suspension in sealed laminate\u003c\/li\u003e\n\u003cli\u003eWorks with any permanent magnet\u003c\/li\u003e\n\u003cli\u003eReusable — field lines reset when magnet removed\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eEvery purchase directly funds independent physics research at the Golden Physics Project.\u003c\/em\u003e\u003c\/p\u003e","brand":"Golden Physics Project","offers":[{"title":"Default Title","offer_id":54143163760932,"sku":"GPP-MAG-FILM","price":19.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2879\/9524\/files\/P8-11803DMagneticFieldObservationBox-022048x2048.jpg?v=1780680515","url":"https:\/\/shop.goldenphysics.org\/products\/magnetic-field-viewer-film-a4-sheet-iron-powder-suspension","provider":"Golden Physics Project","version":"1.0","type":"link"}