Chapter 29 Group Work . A long wire lies on the y-axis with the direction of the current pointing in the positive y-direction. What is the magnitude and direction of magnetic field at x=1.0 m and x=-1.0 m if 2.0 A of current is flowing through the wire? Give your answer in component form. 1.0m 1.0m . A proton, with mass 1.67 x 10-27 kg and charge +1.6 x 10-I9 C, is moving through space with a certain velocity. As it passes through the origin, the magnetic field is measured at X=O.50 m. The direction of the magnetic field is measured to be in the positive y-direction with a magnitude of 33x1020 T. What must be the magnitude and direction of the proton's velocity? Assume that the magnetic field is perpendicular to the velocity