What occurs when you rub your hair against a balloon?

When you rub your hair against a balloon, the friction causes the transfer of electrons from your hair to the balloon. As a result of this transfer, the balloon accumulates a negative charge due to the excess electrons it gains. Concurrently, your hair ends up with a positive charge because it has lost some of its electrons. This phenomenon is a classic example of static electricity and is consistent with the principle of charge transfer through contact (or friction).

This buildup of negative charge on the balloon and positive charge on your hair leads to an electrostatic attraction between them. Such interactions are fundamental in understanding electrostatics and serve as practical demonstrations of how materials can become charged through contact.