• anonymous
(Electricity and Magnetism) Four objects each with charge 1.2×10−4 C are located at the corners of a square whose sides are 2.1 m long. 1. Find the electric force on a charged object placed at the center of the square. 2. Find the total electric potential energy of the system consisting of the four charged objects.
  • Stacey Warren - Expert
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  • katieb
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  • EmmaTassone
|dw:1442777736531:dw| As every object in the corner has the same charge and as they are equally far from that point , they do the same force to the object located in the center. Try to prove it proposing the sum of forces of x and y axis and see what happens, you should get to zero as i said before. In my drawing i supposed the object in the center had the opposite charge that the object in the corner, but if it had the same charge the result would be the same.
  • EmmaTassone
For b) try using this: \[U= U_{1}+U_2+U_3+U_4\] Where U is the electric potential energy. And U is:\[U=\frac{ k qQ }{ r }, k=constant,r=lenght,\] q is the charge of one object and Q the charge of the other involucrated on the interaction.
  • IrishBoy123

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