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Two cententric shells of radii R and 2R ...

Two cententric shells of radii `R` and `2R` have given charge `q` and `-2q` as shown in figure in a region `r lt R`

(a) `E=0`,(b) `E!=0`,(c ) `V=0` (d) `V!=0`

A

`a` and `c` are true

B

`c` is true

C

`a,b,c` are true

D

`a,b,c,d` are true

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