Field of a Long Wire: Three Very Long, Straight, Parallel

Field of a long wire: Three very long, straight, parallel wires each carry currents of 4.00 A, directed out of the page as shown in the figure. The wires pass through the vertices of a right isosceles triangle of side 2.00 cm. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle?

A) 4.42 × 10^-6 T
B) 1.77 × 10^-5 T
C) 5.66 × 10^-5 T
D) 1.26 × 10^-4 T
E) 1.77 × 10^-6 T