If the mass of a balloon is 1.6$1\mathrm{.}6$ g,$,$ its coefficient of static friction with the wall is 0.76$0\mathrm{.}76$ and the average distance between the oppositive charges is 0.85$0\mathrm{.}85$mm.$.$ what minimum amount of charge must be placed on the balloon in order for it to stick to the wall?