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Question

Which statement best explains why a rubber rod becomes negatively charged when rubbed with fur?


A
The rubber that the rod is made of is a better insulator than fur.
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B
The fur is a better insulator than the rubber.
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C
Molecules in the rubber rod have a stronger attraction for electrons than the molecules in the fur.
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D
Molecules in the fur have a stronger attraction for electrons than the molecules in the rubber rod.
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Solution

The correct option is C Molecules in the rubber rod have a stronger attraction for electrons than the molecules in the fur.
During charging by rubbing (or by friction) process, the material that becomes negatively charged does so because it likes electrons more than the material with which it is rubbed. It means molecules in rubber rod have a stronger attraction for electrons than the molecules in the fur.

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