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A parallel plat e capacitor is made of two circular plates separated by a distance of 5mm and with a dieclectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 3×104V/m, the charge density of the positive plate will be close to

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6×10^–7C/m²

3×10^–1C/m²

3×10⁴C/m²

6×10⁴C/m²

answer is A.

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Detailed Solution

$\begin{array}{l} E = {KE}^{1} = \frac{σ}{ε_{0}}; 2 .2 \times 3 \times 10^{4} = \frac{σ}{8 .85 \times 10^{- 12}} \\ σ = 6 \times 10^{- 7} {Cm}^{- 2} \end{array}$

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