Figure 22-39 shows an uneven arrangement of electrons (e) and protons (p) on a circular arc of

Figure 22-39 shows an
uneven arrangement of electrons
(e) and protons (p) on a circular arc
of radius r = 2.00 cm, with angles
θ1 = 30.0°, θ2 = 50.0°, θ3 = 30.0°, and
θ4 = 20.0°. What are the (a) magnitude and (b) direction (relative to
the positive direction of the x axis) of
the net electric field produced at the
center of the arc?