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An infinite planar sheet of charge has a charge density, σ. This sheet lies in the
XX plant at a height z=0 and has a circular hole of radius a cut out of it. The
center of this hole is located at the origin (x=y=0).
a. Calculate the magnitude and direction of the electric field at a distance z
above the center of the hole. (Hint: use the law of superposition)

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