Question

What is $r$ Squared in Coulomb's Law?

Answer 1

1. Coulomb's Law says that the electrostatic force between two stationary and electrically charged point particles is proportional to the product of the charges' magnitudes and inversely proportional to the square of their distance.
2. $F=\frac{1}{4\pi {\epsilon }_0}\frac{q_1\times q_2}{r^2}$Here, $F=$ Electrostatic force in Newton, $q_1,q_2=$ Magnitude of charges in coulomb, $r=$ distance between the charges in meters.
   $\frac{1}{4\pi {\epsilon }_0}=k=9\times {10}^{9}N.m^2.C^{-2}$.
3. Other unknown elements, such as the degree of force and the charges, must now be known or provided in order to determine the distance between the charges. When measuring the distance between the charges (r), the unit of each element is also significant. Before answering the question, convert the units to their standard form to get a correct answer. Furthermore, because the charges are point charges, the distance between them is calculated from the centre of the charges rather than the surface.
4. Here $r$ squared refers to the distance between the charges in meters.