#F="force between two charges"# #q_1,q_2:"charges"# #d:"distance between two charges"# #"The force between two charges is determined by :"# #F=k(q_1*q_2)/d^2# #"let's calculate distance between two charges"# #P_1=(3,-2)# #P_2=(7,-1)# #Delta x=P_"2x"-P_"1x"=7-3=4# #Delta y=P_"2y"-P_"1y"=-1+2=1# #d=sqrt(Delta x^2+Delta y^2)" "d=sqrt(4^2+1^2)" "d=sqrt17# #F=k(1*(-3))/(sqrt17)^2# #F=(-3k)/17" "k=9*10^9 N*m^2*C^-2# #F=(-3*9*10^9)/17# #F=-(27*10^9)/17# #F=-1,59*10^9" "N#