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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Correct Answer - `(i)zwro (ii) (rho_(1))/(4(iepsi_(0)r)),(iii) (rho_(1)+rho_(2))/(2piepsi_(0)r)`

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