In a particular region there is a uniform current density of 19 a/m2 in the positive z direction. what is the value of contour integral upper b overscript right-arrow endscripts times ⅆ s overscript right-arrow endscripts when that line integral is calculated along the three straight-line segments from (x, y, z) coordinates (6d, 0, 0) to (6d, 2d, 0) to (0, 0, 0) to (6d, 0, 0), where d = 23 cm? number units