Question

two students are experimenting with two neutral objects – a foam square and a sample of animal fur. they rub the two together and the foam square becomes charged negatively and the fur becomes charged positively. complete the analysis of this situation.

before

#p⁺ = #e⁻
#p⁺ > #e⁻
#p⁺ < #e⁻

#p⁺ = #e⁻
#p⁺ > #e⁻
#p⁺ < #e⁻

after

#p⁺ = #e⁻
#p⁺ > #e⁻
#p⁺ < #e⁻

#p⁺ = #e⁻
#p⁺ > #e⁻
#p⁺ < #e⁻

how did the foam square become charged?

• electrons were added to it.
• protons were added to it.
• electrons were removed from it.
• protons were removed from it.

Explanation:

Step1: Understand charge basics

Objects are neutral when \( \#p^{+}=\#e^{-} \). When rubbed, electrons transfer.

Step2: Analyze foam square charging

Foam square is negative. Since electrons are negative, adding electrons (\( \#p^{+}<\#e^{-} \)) makes it negative. Protons are in nucleus and don't transfer easily. Removing electrons would make it positive.

Answer:

Electrons were added to it.