W 4. A proton moving east at 1.30 x 105 m/s moves through a magnetic field of 4.98 x 10-5 T to the north. What is the magnitude of the force that the proton experiences? (charge of a proton is +1.6 x 10-19 C) 4.05 x 10-18 N 1.04 x 10-18 N 4.05 x 10-12 N 1.04 x 10-12 N