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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 value of A in terms of Q and R is

A

`(2Q^(2))/(piR^(4))`

B

`(3Q)/(pi R^(4))`

C

`(3Q^(2))/(pi R^(3))`

D

`(3Q)/(pi R)`

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