# Physical Force Problem

You can get a standard latex balloon to stick to a wall by rubbing it on your head rst. The friction between the balloon and your hair cause charge to be transferred to the balloon. For the balloon to stick to the wall, the downward gravitational force is balanced by an upward force from static friction. The normal force is provided by the electrostatic force between the charges in the balloon and the equal but oppositely charged polarization induced in the wall’s molecules. If the mass of the balloon is 1:9g, the coecient of static friction is 0:70, and the average distance between the charges is 0:8mm, what minimum amount of charged must be placed on the balloon in order for it to stick to the wall?

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