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  Indian J Med Microbiol
 

Figure 1: Coulomb’s law. Coulomb’s law quantifies the amount of electrostatic force (F) between charged bodies at rest, which are the forces that hold together ionic solids, such as the nonstoichiometric calcium hydroxyapatite in teeth, which deviates from perfect hydroxyapatite by the presence of vacancies and substitutions. The D or dielectric constant in the denominator shows how the forces holding together an ionic solid are diminished by the nature of the surrounding medium. The r2 shows how the force of attraction between two opposite charges diminishes by the square of their separation. The strength of an electrostatic force (F) holding together ions in a crystal is directly proportional to the product of the charges (q1 × q2) and inversely proportional to the square of their separation (r2). F = electrostatic force, q1 and q2 = values for the charges, r = the distance between charges, D = the dielectric constant (= 1 for vacuum and 80 for water)

Figure 1: Coulomb’s law. Coulomb’s law quantifies the amount of electrostatic force (<i>F</i>) between charged bodies at rest, which are the forces that hold together ionic solids, such as the nonstoichiometric calcium hydroxyapatite in teeth, which deviates from perfect hydroxyapatite by the presence of vacancies and substitutions. The <i>D</i> or dielectric constant in the denominator shows how the forces holding together an ionic solid are diminished by the nature of the surrounding medium. The <i>r</i><sup>2</sup> shows how the force of attraction between two opposite charges diminishes by the square of their separation. The strength of an electrostatic force (<i>F</i>) holding together ions in a crystal is directly proportional to the product of the charges (<i>q</i><sub>1</sub> × <i>q</i><sub>2</sub>) and inversely proportional to the square of their separation (<i>r</i><sup>2</sup>). <i>F</i> = electrostatic force, <i>q</i><sub>1</sub> and <i>q</i><sub>2</sub> = values for the charges, <i>r</i> = the distance between charges, <i>D</i> = the dielectric constant (= 1 for vacuum and 80 for water)