A charge -2q is placed at the origin and two charges of q each are placed at a distance a on both sides of the origin along the z-axis. a) What is the volume charge distribution p(r) of this arrangement of charges? Use delta functions. b) Determine the monopole and dipole moments of this arrangement of charges. c) Show that the quadrupole moment is given by -1 0 0 Q = 2qa? -1 0

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