The friction from rubbing the balloon against your hair charges the balloon up with static electricity.
It's called static electricity. Static charges can attract or repel other static charges.
It makes electrical charges attract one another, or repel one another.
Lightning is a dangerous form of static electricity.
This is known as electrostatic induction. As charged object (say positive) is brought near by the neutral object the opposite charges i.e. negative would get attracted towards and positive charges would be pushed away. Yet the object is neutral though the charges got separated. Now due to attraction of unlike charges the neutral is attracted towards the charged one.
The suspending coil of wire gets turned by a torque due to flow of current though it. This torque is due to Lorentz force acting on the two arms of the rectangular coil.