Question

Three point charges +q, –q and +q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are
(a) √2qa along the line joining points (x = 0, y = 0, z = 0) and (x = a, y = a, z = 0)
(b) qa along the line joining points (x = 0, y = 0, z = 0) and (x = a, y = a, z = 0)
(c) √2qa along +ve x direction
(d) √2qa along +ve y direction

Answer 1

Three point charges +q, – q and +q are set at focuses (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) individually. The extent and course of the electric dipole moment vector of this charge assembly are √2qa along +ve x direction.