1. A proton moving with a speed u through a magnetic field with magnetic flux density of 2.5 T experiences a magnetic force of magnitude 4*10^-13 N. a) Write a Matlab function that would take speed u as input parameter and compute the angle (in degrees) between the magnetic field and the proton's velocity. b) Provide a function call with u 2*10^6 m/s and display the output. 22 c) Using this function, plot the dependence of the angle between the magnetic field and the proton's velocity for the range of u between 1.25*10^6 m/s and 5*10^6 m/s.