1. The problem statement, all variables and given/known data A particle of charge of +4.20 x 10^-6 C is 12.0 cm distant from a second particle of charge of -1.70 x 10^-6 C. Calculate the magnitude of the electrostatic force between the particles. 2. Relevant equations Coulombs law is F = (K*Q1*Q2) / R^2 where k = 8.99*10^9, q1 and q2 are the charges, and R is the distance in meters 3. The attempt at a solution Im hoping im just making a simple mistake and not seeing it for this question cause this really seems like plug and chug. K Q1 Q2 R so I did (8.99 x 10^9)(4.20x10^-6)(-1.70x10^-6) / (.12)^2 = -4.457 N that gave me a wrong answer so i tried different variations of putting the decimal like -4457.541, 44.57 and -44.57. What am i doing wrong, i might have just fudged up since I'm doing this by hand but I'm not seeing it. Either that or I have done something fundamentally wrong and don't know any better. It's been a while since I've done a class like this so any help is appreciated.