Here, ?k? = 1 / 4??0 = 9 ? 10 9 N m 2 / C 2 and ?0 is a constant called the permittivity of free space. If you’re familiar with the law of universal gravitation, you’ll notice that Coulomb’s law has a very similar form, with the charges in place of the masses and ?k? in place of ?G?. In particular, both are inverse square laws, so moving the charge twice as far away decreases the strength of the force by a factor of four.
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