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State Coulomb's law in electrostatics and write it in vector form, for two charges.
Two charges A (charge q) and B (charge 2q) are located at points (0, 0) and (a, a) respectively. Let î and ĵ be the unit vectors along x-axis and y-axis respectively. Find the force exerted by A on B, in terms of î and ĵ.
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