`S_1 and S_2 ` are two hollow concentric thin spherical shells enclosing charges Q and 2Q respectively as shown in
What is the ratio of the electric flus through `S_1 and S_2? `
(ii) How will the eletric flux through the shell `S_1 ` change, If a medium of dielectric constant 5 is introduced in the space inside `S_1 ` in place of air ?
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Explanation

(i) According to Gauss.s law electric flux through spherical shell` S_1 `
`phi_1=(1)/(in_0) Q `
and flux through outer shell ` S_2 phi_2=(1)/(in_0) (Q+ 2Q) =(1)/(in_0) .3Q `
` rArr " " (phi_1)/(phi_2) =(1)/(3) `
(ii)When a medium of dielectric constant K=5 is introduced in the space inside the shell `S_1 ` in place or air , flux through `S_1 ` will be modified to
` phi_1 =(1)/(in ) .Q =(1)/(K in _0) Q =(phi_1)/(5) i.e. `flux will be reduced to `(1)/(5)` th of its previous value.