Figure shown a section through two long ...

Figure shown a section through two long thin concentric cylinders of radii a & b with `a gt b`. The cylinders have equal and opposite per unit length `lambda`. Find the electric field at a distance r from the axis for (i) `r lt a` (ii) `a lt r lt b` (iii) `r gt b`

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`0,(2Klambda)/( r ),0`

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