Two long, insulated, straight wires lie in the \(xy\)-plane along the coordinate axes, each carrying a current \(I\) in the positive direction (along \(+x\) and \(+y\), respectively). Four points—\(P_1(a,a)\), \(P_2(-a,a)\), \(P_3(-a,-a)\), and \(P_4(a,-a)\)—are located in the four quadrants at equal distances \(a\) from both wires. At which pair of points is the net magnetic field magnitude greatest, and what is the direction of the net magnetic field at point \(P_2\)?