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The sphere is made of metal. Metal is a conducting material; electrons are free to move about the surface of a conducting material. As such, the location of excess charge can be quickly repositioned upon the surface of a metal sphere due to the free movement of electrons. When the charged plastic tube is brought near the metal sphere, there is a movement of electrons about the sphere's surface. This will result in a separation of charge upon the sphere - with positive charges being concentrated in one location and negative charges being concentrated in another location. The actual locations of excess charge can be predicted by thinking about the types of charge interactions (see Know the Law section).
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