• Support PF! Buy your school textbooks, materials and every day products Here!

Please help, particle accelerated through potential

  • Thread starter grimreefer
  • Start date
  • #1

Homework Statement


A charged particle is accelerated through a potential of 15000 volts, after which it passes between two (parallel)deflecting plates. What voltage must be applied to these plates to deflect the particle an angle of 10 degrees.

0.5 cm between plates, plates are 3 cm long, 10 degrees below horizontal axis, particle intially starts of on the horizontal axis heading into the plates


Homework Equations


I am confused on how you would relate the potential the particle is accelerated through to its velocity. What happens to a particle that passes through a potential, and how does the properties of the potential speed up or slow down the particle.


The Attempt at a Solution


Since im confused about the initial information I dont even have an attempt yet, Im assuming you might need to use the work energy conservation theorem at some point but why
 

Answers and Replies

  • #2
674
2
A charged particle in an electric field feels a force F = qE. Which can be related to F=ma, so you see it will accelerate. Well a change in potential leads to an electric field, so the particle will accelerate (if a positive charge) from a high potential to a low potential.

If you remember the potential is related to the electric potential energy by, EPE = qV. So using conservation of energy, you can find the final velocity knowing the change in potential the particle travels through and its initial velocity.
 

Related Threads on Please help, particle accelerated through potential

Replies
2
Views
15K
Replies
19
Views
1K
  • Last Post
Replies
8
Views
6K
Replies
1
Views
2K
Replies
2
Views
21K
Replies
1
Views
1K
Replies
15
Views
5K
  • Last Post
Replies
10
Views
6K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
5
Views
4K
Top