Answer :
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1. When a wool sweater is pulled over a cotton shirt and they rub together, they can undergo a process called triboelectric charging.
2. During this process, the wool gains a negative charge while the cotton gains a positive charge. This occurs because the two materials have different tendencies to either gain or lose electrons when they come into contact and are rubbed together.
3. The wool gains electrons from the cotton due to their varying electron affinities, resulting in the wool becoming negatively charged and the cotton becoming positively charged.
4. After charging has occurred, the materials will behave near one another by exhibiting electrostatic attraction. The positively charged cotton will be attracted to the negatively charged wool. This attraction is due to the opposite charges on the materials, creating an electrostatic force between them.
I hope this helps clarify what happens when a wool sweater is pulled over a cotton shirt and they rub together. Let me know if you have any more questions!
