Physics
posted by Lisa .
Help, I know the answer is 4.8 X 10^19, but I can not figure out how to do it or what formula to use. The question is "A charge moves a distance of 1.7 cm in the direction of a uniform electric field whose magnitude is 220 N/C. As the charge moves, its electrical potential energy decreases by 1.8 x 10^18 J. Find the charge on the moving particle. Thanks.
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