{"product_id":"quincka-quincke-rotation","title":"Quincka – Quincke Rotation Physics Sticker","description":"\u003cp\u003eQuincka, a silver-haired field-dancer, holds a spinning glowing disc between two plates.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eIn 1896 Georg Quincke saw that an insulating sphere in an oil, placed in a strong steady electric field, can start spinning on its own. Charges pile up on its surface; above a threshold field the arrangement is unstable and a small tilt grows into steady rotation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eE \u0026gt; E\u003csub\u003ec\u003c\/sub\u003e → rotation\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eE: applied DC electric field (V\/m)\u003c\/li\u003e\n\u003cli\u003eE\u003csub\u003ec\u003c\/sub\u003e: threshold field for spontaneous rotation (V\/m)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eQuincke rollers are now used to build self-propelled colloids that flock like birds.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e The direction of spin is chosen at random; the effect needs the particle to relax charge more slowly than the liquid.\u003c\/p\u003e\u003ch3\u003eOn the sticker\u003c\/h3\u003e\u003cp\u003eQuincka holds a glowing cyan spinning disc between two upright plates. Printed text: \u003cstrong\u003eQUINCKA\u003c\/strong\u003e. Pixel-art kiss-cut vinyl sticker, white, in 2″, 3″, 4″ and 6″ sizes.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"2\" × 2\" \/ White","offer_id":50964287357031,"sku":"18019992459928783071","price":4.99,"currency_code":"USD","in_stock":true},{"title":"3\" × 3\" \/ White","offer_id":50964287389799,"sku":"36840432973438104044","price":6.99,"currency_code":"USD","in_stock":true},{"title":"4\" × 4\" \/ White","offer_id":50964287422567,"sku":"32101475471402762946","price":8.99,"currency_code":"USD","in_stock":true},{"title":"6\" × 6\" \/ White","offer_id":50964287455335,"sku":"16893675918632214573","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/8574860816566769511_1200.jpg?v=1793664513","url":"https:\/\/pixelatedphysics.com\/sv\/products\/quincka-quincke-rotation","provider":"Pixelated Physics","version":"1.0","type":"link"}