A group of particles is travelling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.20 km/s in the +x-direction experiences a force of 2.10*10 1 N in the + y-direction, and an electron moving at 4.50 km/s in the - z- direction experiences a force of 8.40*10-16 N in the +y-direction.What is the direction of this the magnetic force? (in the zz-plane)