An example of the build-up of static electricity is when you rub a balloon on your hair or clothing. As you rub the balloon, electrons are transferred from your hair or clothing to the surface of the balloon. This creates a negative charge on the surface of the balloon and a positive charge on your hair or clothing. When you place the balloon near a wall or another object, the opposite charges attract and cause the balloon to stick to the surface. This is caused by the build-up of static electricity on the surface of the balloon.
