When a negatively charged plastic rod is touched to a metal sphere, the negative charges (electrons) will spread out evenly throughout the sphere. This happens because the electrons are free to move in the conductive material of the metal.
As the negatively charged rod touches the sphere, electrons will be repelled by the rod and will distribute themselves evenly over the surface of the sphere due to the electrostatic repulsion between like charges. Once the rod is removed, the electrons will remain evenly distributed across the sphere.
Thus, the correct answer is: They spread out evenly.
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