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

Electric Field at Point Z, Two Charges

  • Thread starter mike_302
  • Start date
  • #1
103
0

Homework Statement



I have drawn the diagram on the attached page... IT contains all information. The question is simply to determine the electric field force at point Z (which is at the very upper edge of the page)



Homework Equations



epsilon= Fe/q


The Attempt at a Solution



scan0001.jpg


I just noticed I forgot to square root the radius (rAZ and rBZ) in the top right corner.. that changes my answer, but not to the right answer.... Now I get 1.44*10^5 . Correct answer is 1.21*10^5

What's wrong :S
 
Last edited:

Answers and Replies

  • #2
38
0
I think it should be sin(90 - theta), not sin(theta)
 
  • #3
103
0
woah... woah... why? tan(theta)=.04/.03 ... that's unarguable... that gives my radius...

And in the Y-component part, we are taught to use sin(theta) for Y-components, where theta is the angle from the positive x-axis.
 
  • #4
38
0
Sorry, I confused sin with cos :S

Edit2: I keep getting 1.15 * 10^5
 
Last edited:
  • #5
103
0
Figured it out... I dropped the sin(53.13) when I multiplied by 2... but to answer your question, sin(180-theta)=sin(theta)
 

Related Threads for: Electric Field at Point Z, Two Charges

Replies
10
Views
499
Replies
3
Views
13K
Replies
1
Views
1K
Replies
2
Views
234
Replies
7
Views
4K
Replies
2
Views
2K
Replies
1
Views
2K
Replies
3
Views
8K
Top