Final answer:
The true statements concerning a good conductor are that it allows electric current to flow easily and has low resistance to electric current. Conductors like metals have many free electrons and exhibit both high electrical and thermal conductivity.
Step-by-step explanation:
Among the statements provided concerning a good conductor, the true ones are b) It allows electric current to flow easily, and c) It has low resistance to electric current. A good conductor, such as metals like copper, silver, and gold, has many free electrons that allow electric charges to move easily through it. Substances like metals have low resistivity and high conductivity, which is why they are used widely in electrical applications. In contrast, an insulator has high resistance and does not allow electric charges to flow easily, making it the opposite of a conductor.
Conduction of Electricity and Heat
Good electrical conductors are generally also good heat conductors. This is because the free electrons that facilitate the flow of electric current also contribute to the transfer of thermal energy.
Superconductivity
In reference to superconductivity, superconductors are materials that exhibit zero electrical resistance, allowing for the unhindered flow of electric current at very low temperatures. They also possess the ability to repel magnetic fields completely.