Chapter 4, Problem 4.5P

Consider the vector field G = (A/p) a_a where A is a constant: (a) evaluate the line integral of G over a circular path segment of radius b (with center at origin), along which the change in ∅ is a. (b) Same as part a, except the path is at radius c > b. and the change in ∅ is -a. (c) Evaluate $\oint G.dL$ over a four-segment path that includes those of parts a and b as two of the segments.