A 2.30 g air-inflated balloon is given an excess negative charge, q = 3.25 10-8 C, by rubbing it with a blanket. It is found that a charged rod can be held above the balloon at a distance of d = 7.60 cm to make the balloon float. Assume the balloon and rod to be point charges. The Coulomb force constant is 1/(4) = 8.99 10 N-m/C and the acceleration due to gravity is g = 9.81 m/s. In order for this to occur, what polarity of charge must the rod possess? 92 is positive 92 is negative 92 is a proton 92 is neutral How much charge 92 does the rod have? 92 =