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Two concentric sphericl shells of radii...

Two concentric sphericl shells of radii a and b (bgt a ) are uniformamly changed and carry equal changes q. Find the electric firld at a distance r from their common centre when `(i) rlt a(ii)altrltb(iii) rgtr. `
[Hint: Draw coaxial cylindrical gaussion surface and appy Gauss thearem]

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The correct Answer is:
`(i)zero(ii) (q')/(4piepsi_(0)r^(2))(iii) (2q)/(4pi epsi_(0)r^(2))`
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NN GHOSH-GAUSS THEOREM AND ITS APPLICATION-EXAMPLES(a)
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