Question: Two parallel plates separated by 50 cm have a potential difference of 10 V between them, as shown in Fig. A positively-charged ion with q = 1.6 × 10-19 C, initially at rest at the left plate, is accelerated between the plates and passes through a small hole in the right plate.
a. What is the electric field between the plates, and what is its direction? (Don't forget units!)
b. If the ion's speed when it passes through the hole in the right plate is v = 2.89 × 104 ms-1, what is its mass?
Fig. An arrangement of charged plates for accelerating positively charged ions.