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Q.

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 x 104 V/m, the charge density of the positive plate will be close to:

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a

6×104C/m2

b

6×10−7C/m2

c

3×10−7C/m2

d

3×104C/m2

answer is B.

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Detailed Solution

E=σε=σKε0=3×104V/m ∴σ=Kε0×3×104       =2.2×8.854×10−12×3×104=6×10−1Cm−2
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