Assertion: coulomb's law | /r/AtLocation | the form
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text: Some writers (particularly those who favour cgs units) prefer to incorporate the 4\(\pi\) into the definition of the permittivity, so that Coulomb’s law appears in the form \(F=Q_1Q_2/(\epsilon_0r^2)\), though it is standard SI practice to define the permittivity as in equation \ref{1.5.3}.