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where ''F'' is the force, ''k''<sub>e</sub> is the [[Coulomb constant]], ''q''<sub>1</sub> and ''q''<sub>2</sub> are the [[Magnitude (mathematics)|magnitudes]] of the two charges, and ''r''<sup>2</sup> is the square of the distance between them. It describes the fact that like charges repel one another whereas opposite charges attract one another and that the stronger the charges of the particles, the stronger the force they exert on one another. The law is also an [[Inverse-square law|inverse square law]] which means that as the distance between two particles is doubled, the force on them is reduced by a factor of four.<ref>{{Cite book|last=Walker, Jearl, 1945-|url=https://www.worldcat.org/oclc/435710913|title=Fundamentals of physics|date=2011|publisher=Wiley|others=Halliday, David, 1916-2010., Resnick, Robert, 1923-2014.|isbn=978-0-470-46911-8|edition=9th|___location=Hoboken, NJ|pages=578|oclc=435710913}}</ref>
== Electric and
[[File:VFPt_charges_plus_minus_thumb.svg|thumb|[[Field line|Electric field lines]] point from positive charges to negative charges.]]
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