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 the dielectric is 3 × 10⁴ V/m, the charge density of the positive plate will be close to

(a) 6 × 10⁴ C/m²

(b) 6 × 10^–7 C/m²

(c) 3 × 10^–7 C/m²

(d) 3 × 10⁴ C/m²

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