When air is blown in between the two balls, will they attract or repel?

Air is blown in between two pith balls suspended freely. a)What will happen to the balls? (i)They repel each other. (ii)They attract each other. (iii)They start oscillating. (iv)They remain in their initial position. (v)They fall on the ground. b)Give your explanation.

If the distance between two bodies that attract each other is trebled, how many times will their mutual force of attraction be? (9 time, 3 times, 1/3 , 1/9 )

If the air medium between the two charges is replaced by water what change you expect in the electrostatic force and why?

If the distance between two bodies that attract each other is doubled, how many times more will be their. mutual force of attraction?