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The negatively charged balloon initially clings to the wall due to electrostatic attraction. Eventually, it could fall due to factors such as air currents, material properties, or the weakening of the electrostatic forces over time.
When you rub the balloon with a duster, electrons are transferred from the duster to the balloon. This excess of electrons on the balloon gives it a negative charge. Electrons are negatively charged particles, so when they are transferred to an object, that object becomes negatively charged.
If a charged balloon touched a neutral balloon, electrons from the charged balloon would be transferred to the neutral balloon, causing the neutral balloon to become negatively charged. This is due to the principle of electrostatic induction.
When the balloon is rubbed against someone's sleeve, electrons from the sleeve are transferred to the balloon, causing it to become negatively charged. This imbalance of electrons on the balloon's surface creates a negative charge.
An example of a negatively charged object in contact with a neutral object would be rubbing a balloon on a sweater. The balloon becomes negatively charged and can attract the neutral object (sweater) due to the presence of opposite charges.
Rubbing a balloon with your hand will cause the balloon to become negatively charged. This is due to the transfer of electrons from your hand to the balloon, creating a static electric charge. The negatively charged balloon can then attract positively charged objects or even stick to certain surfaces due to static electricity.