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A point charge + 10 µ C is at a distance 5 cm directly above the center of a square of side 10 cm as shown in Fig. What is the magnitude of the electric flux through the square?

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 Charge is symmetric to all faces of the cube, hence by symmetry each face would have equal flux passing though it.

Consider that the charge q is at a distance of 5cm from the square ABCD of each side 10 cm [figure]. The square ABCD can be considered as one of the six faces of a cube of each side 10cm. Then, according to Gauss’s theorem, total electric flux through all the six faces of the cube

Obviously, the flux through the square ABCD will be

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