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electric potential

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Given a square of side length a = 6 cm. We place a charged particle at each corner, three of them carry +7 nC of charge and one carries the same amount of negative charge. What is the electric potential at the center of the square? Choose V = 0 V for a position very far from the square.

  • electric potential -

    electric potential is a scalar, so you add each.

    V= kq1/d+kq2/d + ... notice the negative just cancels from one of the positive.

    = 14E-9 * k/d where d= 1/2 diagonal length.

    Dealing with scalars is nice.

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