If same charge $q$ is placed inside a sphere and cube having radius 1 m and side 2 m respectively. What will be the ratio of flux passing through them?

According to Gauss's law, electric flux passing through a closed surface is equal to $\frac{1}{\varepsilon_0}$ times the charge (q) enclosed by the surface i.e. $\phi=\frac{\mathrm{q}}{\varepsilon_0}$ Since, cube and sphere, both enclose same charge, therefore flux passing through cube and sphere is same. i.e. $\phi_{\text {sphere }}=\phi_{\text {cube }}$ $\therefore \quad \phi_{\text {sphere }}: \phi_{\text {cube }}=1: 1$