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let three charges are placed at the vertices of equilateral triangle then net potential at any point is given by
V = V1 +V2 + V3
V = kq/r , so
V1,V2,V3 = Kq/r1 , kq/r2 , kq/r3
V = kq(1/r1+1/r2+1/r3)
since charges are same & of same sign so kq is taken out of brakett now
V is 0 if q is 0 or if r1,r2,r3 all are infinity
so , the only condition is that a point shoud be at infinity ...
inside the triangle only electric field can be 0 not potential...
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