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Find the magnitude of the polarization vector P in a dielectric material with epsilon r = 2.8 if D = 3.0 X 10-7 dC / m2. Are the details in the question very less to answer the question. Is there some value missing, or we can find the polarization vector with the given values only ?

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In Gaussian units $D=E+4\pi P$, so $4\pi P=(\epsilon-1)E=(\epsilon-1)D/\epsilon$.

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