4. Question If yourub a balloon on your head and remove it, your hair stands up straight. Why does this occur? Because the hairs have the opposite charge and repel each other Because the hairs have the same charge and repel each other Because the hairs have the opposite charge and attract each other Because the hairs have the same charge and attract each other.

The correct answer is: **Because the hairs have the same charge and repel each other.**<br /><br />Rubbing a balloon on your head transfers electrons from your hair to the balloon. This leaves your hair with a net positive charge. Since objects with like charges repel each other, the individual hairs, now all positively charged, push away from each other, causing them to stand up.<br />