3. As shown in the figure, a current of 3D204 flows through a long U-shaped (hairpin)-shaped conductor made by bending the conductor in a semicircle with a radius of R = 100mm.  Point 6 is the middle of the straight part, very far in a semicircle, and the straight part can be approximated as an infinity line.  Find the (a) magnitude and (b) direction of B at point a, respectively, and (c) magnitude and (d) |  Find each direction

3. As shown in the figure, a current of 3D204 flows through a long U-shaped (hairpin)-shaped conductor made by bending the conductor in a semicircle with a radius of R = 100mm.  Point 6 is the middle of the straight part, very far in a semicircle, and the straight part can be approximated as an infinity line.  Find the (a) magnitude and (b) direction of B at point a, respectively, and (c) magnitude and (d) |  Find each direction.