College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 76

Two long, parallel wires carry currents of I 1 = 3.00 A and I 2 = 5.00 A in the direction indicated in Figure P19.50. (a) Find the magnitude and direction of the magnetic field at a point midway between the wires ( d = 20.0 cm). (b) Find the magnitude and direction of the magnetic field at point P , located d = 20.0 cm above the wire carrying the 5.00-A current.