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a point charge q=-8.0nC is located at origin . find electric field vector at point x=1.2m,y=-1.6m

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http://www.jiskha.com/display.cgi?id=1333202504

r = sqrt(x^2+y^2) = 2 m
E =k•q/r^2 =9•10^9•8•10^-9/2^2 =18 V/m (directed to the charge)

-18 v/m

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