Chapter 24, Problem 30P

GO The smiling face of Fig. 24-49 consists of three items:

1. a thin rod of charge − 3.0µ c that forms a full circle of radius 6.0 cm;

2. a second thin rod of charge 2.0 µ c that forms a circular arc of radius 4.0 cm. subtending an angle of 90^° about the center of the full circle;

3. an electric dipole with a dipole moment that is perpendicular to a radial line and has a magnitude of 1.28 × 10^-21 C · m.

What is the net electric potential at the center?

Figure 24-49 Problem 30.