There point masses each of mass 2kg are placed at the vertices of an equilateral of side 4cm. The net gravitational field at the centroid of the triangle is

The three masses generate gravitational field intensity with same magnitude, at an angle of 1200 with each other as shown in the fig. By symmetry the net field at the centroid is zero.Gravitational field strength=Gmr2 towards vertex of the equilateral triangle resultant of these 3 electric field strengths is equal to zero