Please explain this further. I have no idea what these i\'s andj\'s are. What is

Question

Please explain this further. I have no idea what these i's andj's are. What is the force due to the charge that is diagonal from theone we are examining? I see that the force on A from B and D are each 3.24x10^7, butI don't see how to find the force due to C. Thanks, Please explain this further. I have no idea what these i's andj's are. What is the force due to the charge that is diagonal from theone we are examining? I see that the force on A from B and D are each 3.24x10^7, butI don't see how to find the force due to C. Thanks,

Explanation / Answer

To find the force due to C, you must use Coulomb's Law (Fe=k*q1*q2 / r^2), but this time you'll have to use the Pythagorean Theorem (a^2+b^2=hyp^2) to get the distance between the charges, which is your value for r.  Because your r increases, your force due to that charge should be smaller than the two "side" forces.

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