일반물리학 2 — Electric Potential: Problem 27

27 In Fig. 24-33, a charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by distance \(d = 2.00 \text{ mm}\). The plate potentials are \(V_1 = -80.0 \text{ V}\) and \(V_2 = -50.0 \text{ V}\). The particle is slowing from an initial speed of \(200 \text{ km/s}\) at the left plate. (a) Is the particle an electron or a proton? (b) What is its speed just as it reaches plate 2?