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A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them .When the electric field in dielectric is $\;3 \times 10^{4}\;V/m\;$ , the charge density of the positive plate will be close to :

$(a)\;6 \times10^{-7}\;C/m^{2}\qquad(b)\;3 \times10^{-7}\;C/m^{2}\qquad(c)\;3\times10^{4}\;C/m^{2}\qquad(d)\;6 \times10^{4}\;C/m^{2}$

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