In metal objects, charges are free to move due to the presence of free electrons, while in non-metallic objects, charges cannot move or flow within the object's volume. Consider this object as metal. Some electrons from the environment move towards the metal. Electrons are particles. Nearby particles with the same charge experience the Coulomb force. Electrons are free to move through the metal's electron cloud. Each electron will move further away from the other. The furthest distance will be reached when the electrons are on the outer surface of the metal. In other words, the electrons will be evenly distributed across the outer surface of the metal. Inside the metal itself, the electrical charge is neutral.
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