1. How much Coulombs force is exerted on a proton by an electron if they are 15mm away from each other? Is the force attractive or repulsive? 2. http://www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l3b1.gif [Broken] where k=9* 10^9 N*m^2/c^2 3. I know that the force is attractive,http://www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l3b2.gif [Broken] but I don't know where to find some elements in Coulombs law.