Question: Suppose a charge q is placed at point x = 0, y = 0. A second charge q is placed at point x = 8.0

Suppose a charge q is placed at point x = 0, y = 0. A second charge q is placed at point x = 8.0 m, y = 0. What charge must be placed at the point x = 4.0 m, y = 0 in order that the field at the point x = 4.0 m, y = 3.0 m be zero?

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