An isotropic material of relative permittivity Er is placed normal to a uniform external electric field with an electric displacement vector of magnitude 6*10^-4 C/m^2. If the volume of the slab is 0.7m^3 and magnitude of polarization is 5*10^-4 C/m^2. Find the value of Er and total dipole moment of the slab

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An isotropic material of relative permittivity Er is placed normal to a uniform external electric field with an electric displacement vector of magnitude 6*10^-4 C/m^2. If the volume of the slab is 0.7m^3 and magnitude of polarization is 5*10^-4 C/m^2. Find the value of Er and total dipole moment of the slab. 

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