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Coulomb's Law gives us an expression for the electric field caused by a point charge with magnitude . Suppose we have several point charges. The electric field at a location is the vector sum of point charge contributions. Consider a standard x-y coordinate system. A small ball with charge -4.5 nC is located on the x axis at x1 = 6.5 cm. A second ball of charge -8.4 nC is located at x2 = -3.0 cm and y2 = 4.0 cm. (a) Find the components of the net electric field at the origin. Ex = , Ey = (b) Find the magnitude and direction of the net electric field at the origin. |E| = at direction (from +x axis).

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