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The arrangement shown consists of three elements.
(i) A thin rod of charge `–3.0 muC` that forms a full circle of radius 6.0 cm.
(ii) A second thin rod of charge `2.0 muC` that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 90° at the centre of the full circle.
(iii) An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude `1.28 × 10^(–21)C-m.` Find the net electric potential in volts at the centre.
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