Problem 11-35 Potential and kinematics - B

A proton is accelerated from rest from a positively charged plate to a parallel negatively charged plate. The separation of the plates is \(8.9\; mm.\) If the potential difference between the plates is \(75.3\; V,\) what is the speed of the proton just as it hits the negative plate?
[Ans. \(1.2 \times 10^5\; m/s\)]

Accumulated Solution

Proton diagram B


We are going to solve this problem twice with two different approaches. Which approach would you choose first?

(A)  An electrodynamic approach evaluating the force to get the acceleration and finally the velocity.

(B)  An energy approach.