Coulomb's Law (with example)

170219 Like and subscribe. This is an archive, check the link in the end if you are. A simple, easy explanation of the intuition behind Coulomb's law and a worked example of an exam type question.

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1) Coulomb's law accurately measures the size of the force between two charges. It is based on two findings: the size of the electrostatic force is directly proportional to the product of the magnitude of the charges, and the electrostatic force is inversely proportional to the square of the distance separating the charges. When these two findings are translated into a mathematical equation it takes the form F=kq1q2/r^2, where F is the force, k is Coulomb's constant, q1 and q2 are the magnitudes of the charges, and r is the distance separating the charges. This is Coulomb's law.

2) The example worked through in this video tutorial is: Two charges of magnitude 1.8 x 10^-17 C are separated by a distance of 150 nm. What is the size of the electrostatic force experienced by each charge?
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