The two identical charges have a magnitude of ±1.00×10-6 Coulombs which separated by 1 cm. What is the magnitude of the force separating the charges?
F=kq1q2r2=9⋅109⋅1⋅10−6⋅1⋅10−60.012=90 (N)F=k\frac{q_1 q_2}{r^2}=9\cdot10^{9}\cdot\frac{1\cdot10^{-6}\cdot1\cdot10^{-6}}{0.01^2}=90\ (N)F=kr2q1q2=9⋅109⋅0.0121⋅10−6⋅1⋅10−6=90 (N)
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