9 lines
644 B
Markdown
9 lines
644 B
Markdown
[[Electric Force, Field, and Potential]]
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# Summary
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* Charge is quantized, integer multiple of $e=1.6x10^{-19}$.
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* $q=\pm ne$
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* Coulomb's law: $F=k\frac{p_1p_2}{n^2}$; directly proportional to charge, inversely proportional to distance.
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* Same signs repel, opposite signs attract.
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* Electric force is stronger than gravity for tiny particles, gravity controls large scale because big objects are usually neutral.
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* Electric permittivity measures how much a material polarizes in a field. Conductors let charge move freely, insulators don't.
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* Only need to calculate force for 4 or less interacting charges unless situation is highly symmetrical. |