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Coulomb's Law  Four Charges with Coordinates are Given, Find the Electrostatic Force 
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#1
Aug409, 10:27 PM

P: 17

Four pointcharges are fixed at the corners of a 3.0m X 4.0m rectangle. The coordinates of the corners and the values of the charges are listed below.
q1 = 100 microC (0, 4m), q2 = 36 microC (4m, 3m), q3 = 125 microC (0, 3m) and q4 = 32 microC (0,0). Compute the net electrostatic force acting on the 100 microC charge. ke = 8.99 x 10^{9} I'm using Coulomb's Law. F = [tex]\frac{ke*q1*q2}{r^2}[/tex] Here is my attempt at a solution. Is it correct? 


#2
Aug509, 10:58 PM

HW Helper
P: 2,249

Hi antiderivativ,
You can use your 345 triangle you have on the page to find the correct angle. What do you get? 


#3
Aug609, 12:11 AM

P: 17

Thanks for the reply! My new angle is 53.13. Is this better? :)



#4
Aug609, 07:52 AM

HW Helper
P: 2,249

Coulomb's Law  Four Charges with Coordinates are Given, Find the Electrostatic Force
If you look at the 345 triangle about halfway down the page on the left side, the 3 side is vertical and the 4side is horizontal, and that matches your problem and calculation. At the bottom of the page, you switched the 3 and 4 sides. You did the correct procedure; it's just that if you use your original triangle, you'll do: [tex] \tan^{1}\left(\frac{3}{4}\right) [/tex] instead of the arctangent of 4/3. 


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