At a certain instant. a proton is located at a point P with a velocity vector v 36': (3,40 x 105 \"1/3) (E+:+ 2). At P. there exists a uniform magnetic field described by the vector _> B = (0,336 T}(2E g 2). 1. Verify that the magnetic field vector is perpendicular to the velocity vector. 2. Obtain the expression for the magnetic force vector acting on the proton. 3. Determine the magnitudes of the two previous vectors and calculate the radius of the circular trajectory described by the proton. Write the expression of the vector that locates the center of the trajectory with respect to the origin given at point P [(5,451 x 10 \" NH? ]; 5,39 x 105 refs; 0,323 T; 7,47 x 10 3 111.; (5,28 x 10 3 mm} 3]]