Figure 24-60

Homework 24.59

In Fig. 24-60, a charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by a distance d = 2.00 mm. The plate potentials are V1 = -70.0 V and V2 = -50.0 V. The particle is slowing from an initial speed of 90.0 km/s at the left plate. (a) Is the particle an electron or a proton? (b) What is its speed just as it reached plate 2?