Three very long, straight, parallel wires each carry currents of the same magnitude, I= 17 A , directed out of the page, as shown in the figure. The wires pass through the vertices of a right isosceles triangle of side d= 8 cm . What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? H d P d O 6.0*10-4T 6.0*10-6 T O 1.2*10-4T 6.0*10-5 T O 1.8*10-4T