D Question 13 3 pts A beam of protons moves through a uniform magnetic field with a certain magnitude, directed along the positive z-axis. The protons have a velocity of magnitude 2.6 x10* m/s in the x-z plane at an angle of 280 to the positive z axis. If the force on a proton is 3.9 x10-14 N, what is the magnitude of the magnetic field? The charge of the proton is q = +1.6x10-19 C. Include the sign, as needed. 1.997 Previous Next