The smiling face of Figure consists of three items: 1. A thin rod of charge ?? 3.0C

The smiling face of Figure consists of three items:

1. A thin rod of charge ?? 3.0μC that forms a full circle of radius 6.0 cm;

2. A second thin rod of charge 2.0μC that forms a circular arc of radius 4.0 cm, subtending an angle of 90o about the center of the full circle;

3. An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude 1.28 x 10-21 C ?? m. What is the net electric potential at the center?

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