Why does a plastic ruler rubbed on hair loses electrons and gets a positive charge?

The reason the plastic ruler gets a positive charge is because it has the least desire for electrons compared to hair? Does this depend on the material or is just random?

Please explain briefly. Thank you.

1 Answer
Jun 8, 2018

Answer:

This is because of the weak electrostatic force of attraction between the electrons and positively charged nucleus.

Explanation:

This weak electrostatic force of attraction makes it easy for a material to lose electrons with friction.

It does depend on the material. For instance, synthetic material are more likely to gain electrons than natural materials. Eg: if you rub a pyrex glass rod against wool, wool will lose electrons to the glass rod. Thus making the wool positively charged and the glass rod negatively charged.