{"product_id":"inertix-tolman-stewart","title":"Inertix – The Tolman–Stewart Effect \/ Stop = Current Physics Sticker","description":"\u003cp\u003eInertix, a hooded spinner, brakes a whirling coil glowing cyan at its centre.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eSpin a coil of wire fast and stop it suddenly: the free charges inside keep going for a moment, like passengers in a braking bus, and a pulse of current flows. Richard Tolman and Thomas Stewart measured it in 1916 (Phys. Rev. 8, 97). From the charge that flowed they got the carriers' charge-to-mass ratio, close to that of the electron, showing that current in metals is carried by electrons.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ = (m\/e) v\u003csub\u003e0\u003c\/sub\u003e L \/ R\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eQ: charge that flows after stopping (C)\u003c\/li\u003e\n\u003cli\u003em\/e: mass-to-charge ratio of the carriers (kg\/C)\u003c\/li\u003e\n\u003cli\u003ev\u003csub\u003e0\u003c\/sub\u003e: rim speed of the wire before stopping (m\/s)\u003c\/li\u003e\n\u003cli\u003eL: length of the wire (m)\u003c\/li\u003e\n\u003cli\u003eR: resistance of the coil (Ω)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIt is the mechanical twin of the Einstein–de Haas effect: inertia of the carriers shows up as an electrical signal.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e The effect is tiny and needs careful compensation of Earth's field; their m\/e was within about 20% of the electron value.\u003c\/p\u003e\u003ch3\u003eOn the sticker\u003c\/h3\u003e\u003cp\u003eInertix holds a large spinning coil with a glowing cyan core. Printed text: \u003cstrong\u003eINERTIX\u003c\/strong\u003e with the line \u003cstrong\u003eSTOP = CURRENT\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":50964267794535,"sku":"27091309690748150387","price":4.99,"currency_code":"USD","in_stock":true},{"title":"3\" × 3\" \/ White","offer_id":50964267827303,"sku":"23382261746424599946","price":6.99,"currency_code":"USD","in_stock":true},{"title":"4\" × 4\" \/ White","offer_id":50964267860071,"sku":"11236871622840608194","price":8.99,"currency_code":"USD","in_stock":true},{"title":"6\" × 6\" \/ White","offer_id":50964267892839,"sku":"64674927805883158158","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/9566695373778859267_1200.jpg?v=1793663733","url":"https:\/\/pixelatedphysics.com\/fr\/products\/inertix-tolman-stewart","provider":"Pixelated Physics","version":"1.0","type":"link"}