A proton (charge e = +1.60 x 10-19 C and mass mp = 1.67 x 10-27 kg) is moving with a velocity v = 2 x 105 m/s in the positive z direction. A magnetic field of B = 1.25 x 10-1 T is pointing in the positive y direction. Find the magnitude and direction of the force acting on the proton.
4.00 x 10-15 N, in the positive x-direction
4.00 x 10-15 N, in the negative x-direction
1.60 x 10-19 N, in the positive z-direction
1.60 x 10-19 N, in the negative z-direction