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A sphere of radius R contains charge den...

A sphere of radius R contains charge density `rho(r )=A (R-r )`, for `0 lt r lt R`. The total electric charge inside the sphere is Q.
The electric field inside the sphere is

A

`(3Q)/(in_(0) R^(2))[1/3 (r/R)-1/4(r/R)^(2)]`

B

`(12Q^(2))/(R^(3))[1/3 (r/R)-1/4(r/R)^(2)]`

C

`(120Q)/(5in_(0)R^(2))[1/4 (r/R)-1/3(r/R)^(2)]`

D

`(12)/(R^(2)Q)[1/3 (r/R)-1/4(r/R)^(2)]`

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