Question: Consider a rectangle with diagonal length (2 a) in the (y z) plane with the origin at the center of the rectangle. Four beads, each

Consider a rectangle with diagonal length $2 a$ in the $y z$ plane with the origin at the center of the rectangle. Four beads, each carrying charge $q$, are placed on the rectangle perimeter, one bead at each corner. Show that the electric field along the $x$ axis is given by

Ex=k 4qx (x + a)3/2 .

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