Two charges, + q and - q, occupy two corners of an equilateral
triangle, as shown in FIGURE 19-51. (a) If q = 1.8 mC and r = 0.50
m, find the magnitude and direction of the electric field at point
A, the other vertex of the triangle. Let the direction angle be
measured counterclockwise from the positive x axis. (b) What is the
total electric flux through the surface indicated in the figure?
(c) Explain why Gauss’s law cannot...