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what are the magnitude and direction of the force on a charge of

+ 2x 10^ -7 C that is 0.30m from a charge of -5 x 10^-7 C?

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Since their charges are of opposite signs the attract each other.
F = k Q1 Q2 / d^2
= 9*10^9 * 2 * 5 * 10^-14 / 0.09
= 10^-2 Newtons

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