HELP Need answer to this force due to charge problem

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SUMMARY

The discussion revolves around calculating the net force on a charge (q) due to two other fixed charges in a grid layout. The charge q has a magnitude of 3 micro Coulombs, while charge Q is 4.5 micro Coulombs, with the grid squares measuring 0.24 meters on each side. To solve the problem, one must apply the formula for electric force and utilize vector addition to account for the directional nature of forces. The user, Matt, seeks assistance after struggling with the problem for two hours.

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HELP! Need answer to this force due to charge problem!

Here it is:

Three charges are fixed in place as shown. The squares in the grid have sides of length s = 0.24 m. The magnitude of q is 3 mu or micro Coulombs (1 mu or micro Coulomb = 10-6 Coulombs), while the magnitude of Q is 4.5 mu or micro Coulombs. What is the magnitude of the net force on q due to the other two charges?

I really need the answer to the problem, it's killing me, I've worked on it for 2 hours and can't get it. The picture is attached.

Thanks a ton,
Matt

https://www.physicsforums.com/attachment.php?attachmentid=6103&stc=1&d=1137281964
 

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How about writing the formula for electric force, and then putting in the numbers. Remember, the force and electric field are vector quantities, so one must use vector addition.
 

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