SSC JE Electrical Engineering 2017 Set 4 Paper

Electric flux and field intensity inside a conducting sphere is zero. In conducting sphere, all charges are store in outer sphere no charge store in side the conducting sphere.
So gaussian surface enclose no charge in side the conducting sphere
$\oint \mathit{D}.\mathit{d}\mathit{s}=\mathit{\varphi }$
$\mathit{\varphi }=$ Total charge inclosed
$\oint \mathit{D}.\mathit{d}\mathit{s}=0$
[ E = 0 ]
So electric flux and field intensity inside a conducting sphere is zero.