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What is the importance of Coulomb's law ...

What is the importance of Coulomb's law in vector form ?

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Coulomb.s law in vector form tells us that :
(i) Electrostatic force acts along the line joining the two charges and hence it is a central force.
(ii) Two charges exert equal and opposite force on each other, and. so we can say that Coulomb.s law obeys Newton.s third law of motion.
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