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Solution :

potential difference , `V=15xx10^(6) V` <br> Dielectric strength of the surrounding gas `=5xx10^(7) V//m` <br> Electric field intensity, E=dielectric strength =`5xx10^(7)V//m` <br> Minimum radius of the spherical shell require for the purpose is given by <br> `r=V/E` <br> `=(15xx10^(6))/(5xx10^(7))=0.3 m =30 cm `<br> Hence, the minimum radius of the spherical required is 30 cm . Related Video

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