1.) Due to the electrostatic induction that takes place because of friction between the hair and the balloon, The balloon will become negatively charged balloon.
2.) When the charged balloon is brought near the uncharged balloon, There will be attraction between the two balloons
When a balloon is rubbed against hair, the balloon will gain more electrons and the hair will loose electron. The balloon will acquired negative charges and become negatively charged balloon. This is due to the electrostatic induction that takes place due to friction between the hair and the balloon.
When the charged balloon is brought near the uncharged balloon, there will still be electrostatic induction by contact between the two balloons. whereby, the negative electron in the negatively charged balloon pushes the negative ions backward and attracts the positive ions in the uncharged balloon leaving the uncharged balloon to be positively charged balloon.
From the law of electrostatic, which state that, like charges repel and unlike charges attract each others.
Therefore, when you charge a balloon by rubbing it against your hair and brought it near another balloon that is neutral, there will be attraction between the two balloons.
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