Magnitude of net electric field

  • Thread starter mayo2kett
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  • #1
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Four point charges have the same magnitude of 2.2 10-12 C and are fixed to the corners of a square that is 3.0 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.

i tried using E=(k|q|)/r^2 but it wasn't working and i'm not sure how to combine the electric fields for all of the outside charges...

-annie
 

Answers and Replies

  • #2
142
4
Why doesn't that formula work?
 
  • #3
23
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this is what i tried ((8.99e9)(2.2e-12))/((3.0e-2)^2) and i got 21.976... so now am i supposed to multiply by 4??? cause that answer i got isn't right
-annie
 
Last edited:
  • #4
23
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ahha i figured it out... :)
 

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