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which of the following is a good insulator? Wire, doorknob, plastic, nickle

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AL2006
Plastic is a good insulator.

Doorknob MAY be; depends on what it's made of.
Plastic would be a good insulator. Some other common insulators are glass, rubber, air, and wood.
Insulators usually protect us from the dangers of electric currents.
Hope that helped!

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