Most everything starts off neutral. When I rub the balloon on my hair, my hair sends electrons to the balloon. The balloon gains electrons and becomes negative while my hair loses electrons and becomes positively charged.
How does the balloon attract neutral water?
The hydrogen atoms are positive while the oxygen atoms are negative in a water molecule. The water molecules realign themselves to put the positive towards the negatively charged ballon. The molecules are now polarized, or separated. The stream of water alters it path closer to the balloon as it is attracted to it due to opposite charges.
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