The arrangement shown consists of three elementsa. A thin rod of charge −3.0  μC that forms a full circle of radius 6.0 cm.b. A second thin rod of charge 2.0  μc that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 900 at the centre of the full circle.c. An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude 1.28×10−21  C−mFind the net electric potential in volts at the centre