college physics,electric potential

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Four point charges, each with Q = 7.2 µC, are arranged at the corners of a square of edge length 3.6 m. What is the electric potential at the center of the square?
V? Please show me how to solve this.Thanks

  • college physics,electric potential -

    electric potential is a scalar, that is, you can just add it. So figure the potential from one corner, multiply it by 4.

    V=kQ/distance

    distance=edge*sqrt2

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