A sodium ion with mass 2.32×10−26 kg and charge+1.60×10−19 C is moving with velocity3.00×105 m/s in the positive x direction. Anidentical particle is moving with the same speed in the negativex direction, but displaced by +1.50 m in they direction. When the x coordinates of the atomsare equal, a magnetic field perpendicular to their motion is turnedon so that the atoms collide head-on. What are (a) the magnitudeand (b) the direction of the magnetic field?