Magnitude of net electric field

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SUMMARY

The discussion centers on calculating the net electric field at the center of a square formed by four point charges, each with a magnitude of 2.2 x 10-12 C. Three charges are positive, and one is negative, positioned at the corners of a square with a side length of 3.0 cm. The formula used for electric field calculation, E = (k|q|)/r2, where k is Coulomb's constant (8.99 x 109 N m2/C2), was initially misapplied. The correct approach involves vector addition of the electric fields due to each charge, considering their directions.

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  • Understanding of Coulomb's Law and electric fields
  • Familiarity with vector addition in physics
  • Knowledge of the concept of point charges
  • Basic skills in algebra for calculations
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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
 
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Why doesn't that formula work?
 
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:
ahha i figured it out... :)
 

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