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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 outside the sphere is `(k=1/(4pi in_(0)))`

A

`(kQ)/(r)`

B

`(kQ)/r^(2)`

C

`(kQ)/r^(2)`

D

`(kQ^(2))/r^(2)`

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