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Deduce the expression for the electric field E due to a system of two charges q1 and q2 with position vectors r1 and r2 at a point r with respect to common origin.

E=1/4piepsilon_0(q_1hat(r-r_1)/(|r-r_1|^2+q_2_1hat(r-r_2)/(|r-r_2|^2), is there a simpler expression?
Tristram D.
04 January 2018
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