Consider the following figure. Three positive charges lie at three of the corners of a rectangle of horizontal side length x and vertical side length y < x. An 8.00 µC charge is at the upper left corner. A 2.00 µC charge is at the lower left corner. A 4.00 µC charge is at the lower right corner. (a) Find the electric potential, taking zero at infinity, at the upper right corner (the corner without a charge) of the rectangle in the figure. (Let x = 6.80 cm and y = 4.00 cm.)  V (b) Repeat if the 2.00-µC charge is replaced with a charge of −2.00 µC.  V

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Consider the following figure.

Three positive charges lie at three of the corners of a rectangle of horizontal side length x and vertical side length y < x.
  • An 8.00 µC charge is at the upper left corner.
  • A 2.00 µC charge is at the lower left corner.
  • A 4.00 µC charge is at the lower right corner.
(a) Find the electric potential, taking zero at infinity, at the upper right corner (the corner without a charge) of the rectangle in the figure. (Let x = 6.80 cm and y = 4.00 cm.)
 V

(b) Repeat if the 2.00-µC charge is replaced with a charge of −2.00 µC.
 V
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