In combing hair, how do I know which one is getting what charge?

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In hair combing, the charge generated can be positive or negative, depending on the materials involved. The triboelectric effect explains how different materials gain or lose electrons, leading to static electricity. For hair, it typically becomes negatively charged when combed with materials like plastic. The triboelectric series can help determine which materials will charge positively or negatively when in contact. Understanding these principles can aid in predicting the charge of hair during grooming.
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Homework Statement
In combing hair, how do I know which one getting what charge?
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In combing hair, how do I know which one getting what charge?
Hair is getting + ve or - ve charged?
 
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Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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