The figure shows, in cross
section, four thin wires that are parallel, straight, and very
long. They carry identical currents of i = 4.00 A in the directions
indicated. Initially all four wires are at distance d = 18.3 cm
from the origin of the coordinate system, where they create a net
magnetic field ModifyingAbove Upper B With right-arrow. (a) To what
value of x must you move wire 1 along the x axis in order to rotate
ModifyingAbove Upper B With right-arrow counterclockwise by 30°?
(b) With wire 1 in that new position, to what value of x must you
move wire 3 along the x axis to rotate B by 30° back to its initial
orientation?