[" (a) "r/K" (b) Kr "f(c)(1)/(sqrt(K))" (d) "r+sqrt(K)" by a distance of "3.2times10^(-15)m" ."],[" What is the Coulomb's force between two a -particles separated by a distance of "3.2times10^(-15)m" ."],[" (a) "90N" .(b) "45N" (c) "60N" .(d) "75N],[" (3) "(7w" identical balls cach have a mass of "10g" .What charges should these balls the redic the be ")/(7w" identical balls cach have a mass of "10g" .What charges should these balls the redic the be ")be" the be be the be be be the be be "]