Which of the following is an insulator?

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Copper

Air

Iron

Impure water

answer is B.

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Detailed Solution

Air is an insulator.
Insulators are materials that do not allow electricity to pass through them. Insulators are used to protect against the harmful effects of electricity because they oppose electric currents. Insulators include glass, air, wood, plastic, and rubber. Although air is a good thermal insulator in general, it can transmit heat through convection. Heat flow from one air pocket to another, on the other hand, is difficult if the air pockets inside the insulating material are separated from each other.
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