Q .     The electric field in a certain region is acting radially outward and is given by `E=Ar`. A charge contained in a sphere of radius `'a'` centered at the origin of the field, will be given by

AIPMT 2015
A

`4\pi \epsilon_0Aa^3`

B

`\epsilon_0Aa^3`

C

`4\pi \epsilon_0Aa^2`

D

`A \epsilon_0a^2`

HINT

From Gauss's law, `\oint \vec{E}\cdot \vec{dS} = \frac{q_{enc}}{\epsilon _0}`

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