Q.7 An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

When an inflated balloon was rubbed with a piece of synthetic cloth, then the synthetic cloth loses electrons to the balloon, thus becoming positively charged and making the balloon negatively charged.

Now when the balloon is pressed against the wall, then the negatively charged balloon makes the uncharged wall to lose electrons away from the balloon, thus making the wall positively charged.

It was found that the balloon sticks to the wall because of this electrostatic attraction in which both the charged particles tend to attract each other, thus getting stuck with each other.