" Three charges "2q,-q," and "-q" are located at the vertices of an equilateral triangle.At the centre of the triangle,"

Three charges 2q, -q, and -q are located at the vertices of an equilateral triangle. At the center of the triangle,

Three charges 2q, -q, and -q are located at the vertices of an equilateral triangle. At the center of the triangle,

Three charges 2q,-q,-q are located at the vertices of an equilateral triangle.At the centre of the triangle (A) The field is zero but potential is non-zero (B) The field is non-zero but potential is zero (C) Both field and potential are zero (D) Both field and potential are non-zero