Which of the following can conduct electricity owing to the presence of free mobile electrons?
Answer Details
The substance that can conduct electricity owing to the presence of free mobile electrons is copper. Copper is a metal, and metals are generally good conductors of electricity because they have a large number of free mobile electrons that can move through the material when an electric field is applied. Germanium and silicon are semiconductors, which means that they can conduct electricity under certain conditions, but they do not have as many free electrons as metals. Grapefruit, on the other hand, is a fruit and not a substance that can conduct electricity.