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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 the dielectric is`3 xx 10^(4) V//m`, the charge density of the positive plate will be close to :

A

`6xx10^(-7)C//m^2`

B

`3xx10^(-7)C//m^2`

C

`3xx10^4C//m^2`

D

`6xx10^4C//m^2`

Text Solution

Verified by Experts

The correct Answer is:
A
`6xx10^(-7)C//m^2`
Explanation: `E=sigma/(kepsi_0)`
`sigma=EKepsi_0`
`=3xx10^4xx2.2xx8.85xx10^(-12)`
`=6xx10" "c//m^2`
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