9 months ago
Last edited at 6:33AM on 3/28/2013
opposite charges attract, because the force that the 2 charges exert on each other is negative. Imagine you have 2 charges, Q1(+) and Q2(-). Q1 is positively charged and Q2 is negatively charged, and they are located w/in a distance of R. According to the coulomb's law, the positive charged atom will produce a positive electrical field, E1=(kQ1/(R^2), and the negative charged atom will produce a negative electrical field, which is -E2=(-kQ2/(R^2). The force that Q1(+) exerted on Q2 is Q1*(-E2), which means Q1 is inducing a negative F on Q2, and causing Q2 to move towards Q1. Vice versa, the force that Q2(-) exerted on Q1 is -Q2*(E1), which causes Q1 to move towards Q2. like charges repel, b/c the force exerted on each of atom is positive, which forces the atom to go outwards.