A wire through which a current is flowing lies along thex-axis

   A wire through which a current is flowing lies along thex-axis as shown. Connecting wires which are not shown in the diagram connect the ends of the wire to batteries (which are also not shown). Electron current flows through the wire in the -xdirection, as indicated in the diagram. To calculate the magnetic field at locationAdue to the current in the wire, we divide the wire into pieces, approximate each piece as a point charge moving in the direction of conventional current, and calculate the magnetic field at the observation location due only to this piece; then add the contributions of all pieces to get the net magnetic field.            The wire is 1.9m long, and is divided into 8 pieces. The observation locationAis located at<0.118,0.261, 0 > m.The conventional current running through the wire is 8.5amperes. In this exercise you will calculate the magnetic field at the observation location due only to segment 1 of the wire.See the attachment carefully, I just want to know what is the answer about the last queation and how to get it. PS: the solution must be step by step until the final answer, procedure and explaination must be showing on the answer. Do not worry about the rest the queations except the last question, because I was put correct answer in there already.