Figure shows an end view of two long, parallel wires perpendicular to the xy-plane, each carrying a

Question:

Figure shows an end view of two long, parallel wires perpendicular to the xy-plane, each carrying a current I but in opposite directions.
(a) Copy the diagram, and draw vectors to show the B field of each wire and the net B field at point P.
(b) Derive the expression for the magnitude of B at any point on the x-axis in terms of the x-coordinate of the point. What is the direction of B?
(c) Graph the magnitude of B at points on the x-axis.
(d) At what value of x is the magnitude of B a maximum?
(e)What is the magnitude of B when x » a?