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You place 4 charges of equal magnitude Q at the corners of a square of side length L, such that two of the charges are negative and two are positive, with the like charges opposite one another diagonally. What is the potential at the center?

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The electric potential of a point charge `q` at some another point is equal to  `1/(4pi epsilon_0) q/r,` where `r` is the distance from the point to the charge and `epsilon_0` is an absolute constant (the permittivity of vacuum). Note that `q` is a signed...

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