College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 70

Four long, parallel conductors carry equal currents of I = 5.00 A. Figure P19.49 is an end view of the conductors. The direction of the current is into the page at points A and B (indicated by the crosses) and out of the page at C and D (indicated by the dots). Calculate the magnitude and direction of the magnetic field at point P , located at the center of the square with edge of length 0.200 m.