= 要 * * * In the Cartesian coordinate (x, y, z) system for a three-dimensional space, there are four wires(= {(x,y,z)|(x

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= 要 * * * In the Cartesian coordinate (x, y, z) system for a three-dimensional space, there are four wires(= {(x,y,z)|(x,y,z) = (cos(* 1), sincs + 1),2), (cos(+ + 2), sinc** + 2),2), (cos(+ + 3), since 3),z) (cos(+ + 4), since* # 4), 2),z € (-00,00)}) where current I (>0) flow +z direction in each wire. What is the direction of magnetic field generated by the wires at the origin? (5pts) * z y X х 1 1 a) +x b) - c) +y d) -