The horizontal portion of the wire in (Figure 1) has a length = 0.100 m , and position P is a perpendicular distance d = 30.0 mm above the center of...

The horizontal portion of the wire in (Figure 1) has a length ℓ = 0.100 m , and position P is a perpendicular distance d = 30.0 mm above the center of the horizontal portion. The wire carries a 40.0-A current, and the two slanted portions of the wire are extremely long.

figure 1: http://i.imgur.com/dHlL6Nj.png