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The arrangement shown consists of three ...

The arrangement shown consists of three elements.
(i) A thin rod of charge `-3.0 mu C` that froms a full circule of radius `6.0 cm`.
(ii) A second thin rod of charge `2.0 mu C` that forms a circular are 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 `1.28xx10^(-21) C-m`.
Find the net electric potential in volts at the centre.

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