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# The net inward flux through any closed surface is $8.0 \times 10^3Nm^2 c^{-1}$. Find the net charge inside the box .

$\phi E= \large\frac{1}{\in_o}$$g$
$\therefore q= \phi E.\in_0$
$\qquad= 8.0 \times 10^3 \times 8.854 \times 10^{-12}$
$\qquad= 70.8 \times 10^{-9}\;c$