Coulombs Law

  • Thread starter Cefari
  • Start date
  • #1
7
0

Homework Statement


Given a cube with equal charges on all corners save one, find the charge on the origin.
http://img79.imageshack.us/img79/4968/cubekg7.jpg [Broken]

Homework Equations


F = kQ1Q2


The Attempt at a Solution


My current idea is splitting up the magnitude of all charges on the origin into their X,Y, and Z components.

Because all magnitudes are formed with right triangles I can use pythagorean theorem to solve for the components and I get:

Q1: +1 in the X
Q2: +1 in the Z
Q3: +1 in the Y
Q4: +1 in the X, Z
Q5: +1 in the X, Y
Q6: +1 in the Y, Z
Q7: +1 in the X, Y, Z

So the sum of the magnitudes acting on the origin would be +4 in all directions, and I have a feeling this is wrong.
 
Last edited by a moderator:

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,836
251
Hi Cefari! :smile:

I don't understand either the question or your answer. :confused:

Do you mean find the field at the origin?

If you're adding fields, remember that they're vectors (with a direction), and the strength is 1/distance-squared.
 

Related Threads on Coulombs Law

  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
2
Views
6K
  • Last Post
Replies
10
Views
6K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
8
Views
5K
Top