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How does a rubber rod become negatively charged through friction?

a. It touches a negatively charged object, and protons move off of the rod.
b. It touches a positively charged object, and electrons move onto the rod.
c. It is rubbed with another object, and electrons move onto the rod.
d. It is rubbed with another object, and protons move off of the rod.

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Answer:

c. It is rubbed with another object, and electrons move onto the rod.

Explanation:

A rubber rod is negatively charged through friction when gains electrons, this occurs when electrons are transferred from another material by simple contact between them. When these two materials are rubbed, the difference in electronic affinity causes one of the materials to be positively charged and the other negatively charged.

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