Physics: Electricity and Magnetism

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Four charges on a rectangle that is 6 cm by 3 cm. All but one of the corners has a positive charge. The magnitudes of the charges are all 8.40e-12 C. What is the net electric field at the center of the rectangle?

  • Physics: Electricity and Magnetism -

    The electric field contribution of the two opposite positive charges cancel out. The two charges on opposite sides that are of opposite sign will double the field due to a single charge. The center of the rectangle is at a distance R from corners that is given by the equation
    R^2 = 3^2 + 1.5^2
    R = 3.354 cm
    Q = 8.40*10^-12 C

    E = 2 * kQ^2/R^2

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