Four charges of equal charge +q are placed at the corners of a rectangle of sides a and b. What is the potential at the center of the rectangle if q = 2.0 $\mu$C, a = 30. mm, and b = 40. mm?

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The Answer of Four charges of equal charge +q are placed at the corners of a rectangle of sides a and b. What is the potential at the center of the rectangle if q = 2.0 $\mu$C, a = 30. mm, and b = 40. mm?

Four Charges of Equal Charge +Q Are Placed at the Corners