An electron that has a velocity with x component 2.0 x 106 m/s and y component 4.2 X 106 m/s moves through a uniform magnetic eld with x component 0.034 T and y component -0.20 T. (3) Find the magnitude of the magnetic force on the electron. (b) Repeat your calculation for a proton having the same velocity. (a) Number I Units ' V' (b) Number I Units ' V' In the figure, an electron accelerated from rest through potential difference V1=1.50 kV enters the gap between two parallel plates having separation d = 18.8 mm and potential difference V2= 179 V. The lower plate is at the lower potential. Neglect fringing and assume that the electron's velocity vector is perpendicular to the electric field vector between the plates. In unit-vector notation, what uniform magnetic field allows the electron to travel in a straight line in the gap? d Number ( it i - . > + k ) UnitsA strip of copper 110 pm thick and 4.70 mm wide is placed in a uniform magnetic eld of magnitude B = 0.55 T, that is perpendicular to the strip. A current i = 30 A is then sent through the strip such that a Hall potential difference V appears across the width. Calculate V. (The number of charge carriers per unit volume for copper is 8.47 x 1028 electrons/m3.) Number l Units v