Answer :

Given:


Charge on the ith particle ,


Distance of ith particle from origin,


________________________________________________


Formula used:


By Coulomb’s law, the electric force is given by:



Where ϵ0 is the permittivity of free space


q1 and q2 are the magnitude of charges


r is the distance of separation between the charges


__________________________________________________


Magnitude of force on the 1C charge due to ithparticle is given by:


(Here, q1 =, and )



Substituting the values, we get



All the forces are in negative-x direction. Hence, we can simply add them up to get the magnitude of net force.





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