Which of the following is NOT a good conductor?

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Multiple Choice

Which of the following is NOT a good conductor?

Explanation:
Electrical conductivity depends on how easily charges can move. Good conductors have many free charge carriers that allow current to flow easily. Metals like copper and aluminium have electrons that move readily, making them excellent conductors. Water with dissolved salts contains ions that carry charge and thus conducts electricity as well. Rubber, by contrast, has very few free charge carriers and high resistance; it acts as an electrical insulator, preventing current flow. Therefore rubber is not a good conductor, while copper, aluminium, and salted water all conduct electricity well.

Electrical conductivity depends on how easily charges can move. Good conductors have many free charge carriers that allow current to flow easily. Metals like copper and aluminium have electrons that move readily, making them excellent conductors. Water with dissolved salts contains ions that carry charge and thus conducts electricity as well. Rubber, by contrast, has very few free charge carriers and high resistance; it acts as an electrical insulator, preventing current flow. Therefore rubber is not a good conductor, while copper, aluminium, and salted water all conduct electricity well.

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