A piezoelectric plate of thickness 2d, due to inhomogeneous deformation, is polarized so that its polarization at the center is equal to P0, is directed along the x axis and varies according to the law P = P0(1 - x2/d2), where x is measured from the plane of symmetry of the plate. Determine the electric field strength inside and outside the plate, as well as the potential difference U between its surfaces.

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