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Wood, plastic, rubber and air are good insulators because A. they conduct charge. B. charge flows easily. C. they don’t have free electrons. D. they have low resistance.
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Wood, plastic, rubber and air are good insulators because A. they conduct charge. B. charge flows easily. C. they don’t have free electrons. D. they have low resistance.

User Anton Antonov
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C. They don't have free electrons.
The only things capable of conducting a charge are things that have charged particles in them that are free to move, e.g free electrons, free positions, or dissociated ions
User Trbaphong
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