I've been working on the following problem but when I try my answer online, it keeps coming up as incorrect. A charge Q1=-9.4 C is 4.8 m from a charge Q2 = 3.6 C. What is the magnitude of the electrostatic force on Q1? I'm pretty sure for this its just Coulomb's Law so: F = (k(Q1*Q2))/r^2 F = ((8.9876*10^9)(-9.4*3.6))(4.8^2) F ~ 1.32 * 10^10 N Taking into account sig. figs, my final answer is 1.3*10^10 N. \ However, this keeps coming up as incorrect. Am I overlooking something? Thanks in advance for the help!