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# Coulomb2 - 1 C e q =-e = ⋅-o Proton 1 C p q = e = ⋅-o...

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Coulomb’s Law Disclaimer: These lecture notes are meant as a study aid and not as a replacement for the course textbook. Please report any inaccuracies to the professor. Electric Charge It is an intrinsic property of particles (i.e. electrons and protons) Comes in both positive and negative amounts (assignment of + and – chosen by Ben Franklin) o Interestingly, other fundamental forces have more or less different types of “charge”. Gravity just has one: mass. The strong nuclear force has nine! You could think of them as “red”, “green”, “blue”, “anti-red”, “antigreen”, “anti-blue”. Usually denote charge by letter “q” (or “Q”), unit of measure is the Coulomb, C, in SI units o Electron:
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Unformatted text preview: 1.6022 10 19 C e q = -e = - ⋅-o Proton: 1.6022 10 19 C p q = e = ⋅-o In fact, all charge is quantized in integer multiples of “e” (see further below) Most matter is electrically neutral (balanced: equal amounts + and -) o For example, hydrogen, as with all atoms, is neutral. That is lucky for us, otherwise we would have strong attractions to other pieces of matter. But this observation is not explained by any verifiable theory yet! Can get a net imbalance of electric charge: o Silk on glass ⇒ excess + charge on glass o Fur on plastic ⇒ excess -charge on plastic Net charge is always conserved Like-sign charges repel Opposite-sign charges attract Need a force law to describe this!...
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