2- An electric voltage, AV = 50 V is applied across two parallel plates separated by a distance, d = 5x10 m. (a) Find the magnitude of the uniform clectric field between the plates. (b) A proton is released from the positive plate (v = 0). Find the kinetic energy of the proton as it strikes the negative plate. What is the total work done on the proton during this motion? Express your answer for part b in Joule and in electron volts. 3- In a velocity selector uniform electric and magnetic fields are given by, E Ei and B (- 15 x10 T)k. A proton with velocity, v= vertical combination of E and B fields. (a) Find the magnitude of the electric field. (b) In what direction another proton moving along the same direction but, having higher speed would be deflected in this velocity selector? (Note that i, j, k are the unit vectors along the x, y and z axis). %3D (2x10 m/s)i is observed not to be deflected in this