Kinetic energy from plate A to plate B

Click For Summary

Homework Help Overview

The problem involves an electron acquiring kinetic energy while being accelerated by an electric field between two plates in a computer monitor. The focus is on determining the potential difference between the plates and identifying which plate has a higher potential.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the relationship between kinetic energy and potential energy, questioning how the potential energy of the electron at plate A relates to the potential difference. There is also inquiry into the nature of electric charge and potential, specifically regarding which plate is positive or negative and how that affects potential.

Discussion Status

The discussion is ongoing, with participants exploring various aspects of the problem, including the conservation of energy and the implications of electric potential. Some guidance has been offered regarding the relationship between kinetic and potential energy, but no consensus has been reached.

Contextual Notes

Participants note that limited information is provided, specifically only the kinetic energy acquired by the electron. There is also a mention of the need to understand the relationship between the plates' potentials and the electron's potential energy.

hanna.eunice
Messages
2
Reaction score
0

Homework Statement


An electron acquires 3.45x10^(-16) J of kinetic energy when it is accelerated by an electric field in a computer monitor from plate A to plate B. What is the potential difference between the plates, and which plate is at the higher potential?


Homework Equations


KE=1/2mv^2


The Attempt at a Solution


The given answer is 2.16x10^3V...How and why?
Plate B has the higher potential.
 
Physics news on Phys.org
What is the potential energy of the electron at plate A?
 
Nothing is given other than the acquired electron energy of 3.45x10^(-16). Sorry!
 
Would the electron be attracted to a positive plate or a negative plate? Which plate (positive or negative) would have a higher potential?

Conservation of Energy: All the electric potential will be converted to kinetic.
 
hanna.eunice said:
Nothing is given other than the acquired electron energy of 3.45x10^(-16). Sorry!

That is correct, but the electron still has some potential energy. How is it related to the difference of the plates' potentials?
 

Similar threads

Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 3 ·
Replies
3
Views
7K
  • · Replies 16 ·
Replies
16
Views
1K
  • · Replies 18 ·
Replies
18
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
3
Views
9K
  • · Replies 3 ·
Replies
3
Views
2K