{"product_id":"hoopion-current-loop-pixel-sticker","title":"Hoopion – Current Loop Physics Sticker","description":"\u003cp\u003eMeet Hoopion, a ring of wire who turns a circling current into a field straight through the middle. At the centre the field is μ₀I\/(2R): a 5 cm loop carrying 5 A gives about 6.3 × 10⁻⁵ T, close to Earth's own field. Stack many loops and you have an electromagnet. Pixel-art kiss-cut sticker in 2, 3, 4 and 6 inches; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"2\" × 2\" \/ White","offer_id":50658287845479,"sku":"24242326355257524214","price":4.99,"currency_code":"USD","in_stock":true},{"title":"3\" × 3\" \/ White","offer_id":50658287878247,"sku":"19977885074582601879","price":6.99,"currency_code":"USD","in_stock":true},{"title":"4\" × 4\" \/ White","offer_id":50658287911015,"sku":"10606690695759721570","price":8.99,"currency_code":"USD","in_stock":true},{"title":"6\" × 6\" \/ White","offer_id":50658287943783,"sku":"22871062772760442245","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/01_clean_c6183331-9ccb-43eb-83d9-ce21f076fbde.jpg?v=1792798460","url":"https:\/\/pixelatedphysics.com\/products\/hoopion-current-loop-pixel-sticker","provider":"Pixelated Physics","version":"1.0","type":"link"}