A proton travels through uniform magnetic and electric fields. The magnetic field is in the negative x direction and has a magnitude of 2.77 mT. At one instant the velocity of the proton is in the positive y direction and has a magnitude of 1800 m/s.
At that instant, what is the magnitude of the net force acting on the proton if the electric field is in the positive x direction and has a magnitude of 4.28 V/m?