Question

Problem 4 a) A proton with kinetic energy of 1.50x10 eV is fired perpendicular to the face of a large plate that has a uniform charge density of 5.40x10 C/m2. What is the magnitude of the force on the proton submit Answer Tries 06 b) How much work must the electric field do on the proton to bring t to rest? Give only the magnitude of the work done submit Answer Tries 016 c) From what distance should the proton he fired so that it stops right at the surface of the plate? Submit Answer Trics 06

Answer 1

a) F = qE = e sigma/2 epsilon_0 = 1.6 times 10^- 19 times 5.4 times 10^- 6/2 times 8.85 times 10^- 12 F = 4.88 times 106 - 14 N b) work to be done = KE_L W = 1.5 times 10^6 ev c) W = F s 1.5 times 10^6 times 1.6 times 10^- 19 = 4.88 times 10^- 14 times s s = 4.92m