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Magnetic field around a straight wire

A straight wire carries an electric current symbolized by several little red spheres in motion (they move in the direction of conventional current, they are not electrons). Circular magnetic field lines are shown around the wire. More physics videos at http://bestphysicsvideos.blogspot.com/ -------- Un fil rectiligne est parcouru par un courant ?lectrique repr?sent? par des petites sph?res rouges en mouvement (elle se d?placent dans le sens du courant conventionnel: ce ne sont pas des ?lectrons). Des lignes de champ magn?tique circulaires entourent le fil. Pour d'autres vid?os de physique: http://videosphysique.blogspot.com/
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