Consider a system of charges q1, q2, ………..qn placed at distances r1, r2….rn with respect to some origin. Then the electric field intensity due to all these charges at a point is found out using the Principle of superposition. Let 
intensity due to the number of charges q1, q2, ………..qn. Then the resultant electric intensity 
at that point due to these charges is given by the superposition theorem.
Electric field intensity due to the nth charge is
Magnitude of the electric field intensity is given by the equation:
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