the distance of  the charged particlesfrom the
reference point (x1,y1)can be calculated asgiven as
                r
= ?[(x2-x1)2+(y2-y1)2]
     Â
                if
the reference point is the origin then x1,y1 = 0,0 in the
aboveformula
                   the
distance of all the charged particles from the origin must be find
out using the above relation using ofcoordiantes .
if r1 ,r2 and r3 be the distance of the chrged
particlespocessing chrge q1,q2 and q3 from the origin ,
now the net potential at the origin due to the three chargeswill
be the sum of the individual potentials of the threechrges
             V
= V1+V2+V3
              where                               V1
= k.q1 / r12 where k = 1 /4??
simillarly V2 and V3 .
