Question

what is coulomb'law in vector form?

Answer 1

Coulomb's law state us that electrostatic force b/w any two charges q and q' seperated by distance r is directly proportional to the product of the magnitude of the charges and inversely proportional to the square of the distance b/w them.

F=q*q’/4πE* r²







In vector form there will multiplication of r^.


Importance is that we can break its components to know the net effect caused by different charges at different positions.


Fij=kQiQj(ri-rj)/[|ri-rj|]^3.



Importance of vector form: (1):Vector form gives the direction of the force along with magnitude.

(2) When we study force on a given charge by many charges, we use superposition principle. This principle states that electrostatic force on a given charge due to many charges is vector sum of individual forces due to other charges. When we consider effect due to one charge we ignore the presence of other charges. The force on charge 1 due to charges 2,3,…..N is ,according to superposition principle, is given by

F=F12+F13+……….F1N.

Answer 2

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