1. The problem statement, all variables and given/known data Two particles with electric charges Q and −3Q are separated by a distance of 2.5 m. If Q = 4.9 C, what is the electric force between the two particles? 2. Relevant equations Coloumb's equation: F=k*q1*q2/r^2 k=9.0*10^9 3. The attempt at a solution I just tried to plug in the variables into the above equation. so I got F= (9e9)*(4.9)*(3*4.9)/((2.5/2)^2) F= 4.15e11 Apparently, that is not the correct answer, but I don't know what I did wrong! I also tried to divide that number by 2 to get F= 2.07e11 which was also not right. What am I doing wrong?