point charge

noun
an electric charge considered to exist at a single point, and thus having neither area nor volume.
Origin:
1900–05

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Point charge is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
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Chem-X treats the charge on each atom in a molecule as a point charge positioned at the center of the atom.
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