A solid cylindrical conducting shell of inner radius a = 5.1 cm and outer radius b = 7.1 cm has its axis aligned with the z-axis as shown. It carries...

A solid cylindrical conducting shell of inner radius a = 5.1 cm and outer radius b = 7.1 cm has its axis aligned with the z-axis as shown. It carries a uniformly distributed current I2 = 6.4 A in the positive z-direction. An inifinte conducting wire is located along the z-axis and carries a current I1 = 4 A in the negative z-direction. What is the integral from s to p of B dot dL, where the integral is taken along the dotted path shown, first from point P to point R at (x,y) = (0.707d, 0.707d), and then to point S at (x,y) = (0.6d, 0.6d)?