a balloon is negatively charged by rubbing and then clings to a wall. Does this mean that the wall is positively charged ? why does the balloon eventually fall?

Question

hartnn · Answer

No, the wall isn't positively charged.....
when you rub the balloon against the wall, there is flow of electrons from wall to balloon, thus making the balloon negatively charged and wall positively charged AFTER rubbing. This flow of electrons is called Static electricity.

hartnn · Answer

The wall is electrically neutral.
The balloon will eventually fall because some electrons will again flow from balloon to wall, eliminating excess negative charge.

anonymous · Answer

yes if balloon gets negatively charged
wall will have to lose electrons i.e. get positively charged to make the balloon negatively charged....otherwise if wall were to stay neutral it would be not fitting with the fact that charge is conserved

anonymous · Answer

and the balloon would fall it would also loose electrons when you keep it in touch with wall to gain equillibrium i.e. charge will flow back to wall as soon as you bring it in contact with wall