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1. Une charge ponctuelle q est placee a l'interieur d'une sphere creuse metallique. La sphere elle-meme porte une charge -3q. Quelle est la charge sur

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1. Une charge ponctuelle q est placee a l'interieur d'une sphere creuse metallique. La sphere elle-meme porte une charge -3q. Quelle est la charge sur la surface interieure de la sphere ? Quelle est la charge sur la surface exterieure de la sphere ? 2. On maintient fixement une particule de masse 75,0 g chargee de 35,00 UC a l'origine et on place une particule de masse 20,0 g charge de 63,00 MC a 7,20 cm de distance de la premiere, et on la laisse aller. Quelle est la vitesse de la seconde particule quand elle se trouve a distance 19,60 cm ? 3. Quel travail faut-il effectuer pour apporter de l'infini trois charges +q, -q et -q et les placer aux coins d'un triangle equilateral de cote L ? ENGLISH TRANSLATION 1. A point charge q is placed inside a metallic hollow sphere. The sphere itself carries a -3q charge. What is the charge on the inner surface of the sphere? What is the charge on the outer surface of the sphere? 2. A particle of mass 75.0 g charged with 35.00 uC is held fixed at the origin and a particle of mass 20.0 g charged with 63.00 uC is placed at a distance of 7.20 cm from the first, and we let her go. What is the speed of the second particle when it is at a distance of 19.60 cm? 3. What work must be done to bring from infinity three charges +q, -q and -q and place them at the corners of an equilateral triangle of side L

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