Question

A plastic rod becomes negatively charged when it is rubbed with a piece of wool. How does the rod become charged?

Electrons move from the rod to the wool.
Protons move from the rod to the wool.
Electrons move from the wool to the rod.
Protons move from the wool to the rod.

Answer 1

Electrons move from the wool to the rod.

Rubbing transfers electrons (not protons). The plastic gains extra electrons and becomes negatively charged, while the wool loses electrons and becomes positive.