Figure shows a uniformly charged spherical shell B of charge $({\text{q}}_{\text{B}}=\text{q})$  kept inside uniformly charged spherical shell A of charge  $({\text{q}}_{\text{A}}=\text{q})$ . Let electric field due to  A  and  B  at any point are  $\overrightarrow{E_A}$  and  $\overrightarrow{E_B}$  respectively. If dV represents elementary volume, then the value of  $\frac{{\displaystyle {\int }_{\begin{array}{c}\text{ entire }\\ \text{ space }\end{array}} {\overrightarrow{\mathrm{E}}}_{\mathrm{B}}\cdot {\overrightarrow{\mathrm{E}}}_{\mathrm{B}}\mathrm{dV}}}{{\displaystyle {\int }_{\begin{array}{c}\text{ entire }\\ \text{ space }\end{array}} {\overrightarrow{\mathrm{E}}}_{\mathrm{A}}\cdot {\overrightarrow{\mathrm{E}}}_{\mathrm{B}}\mathrm{dV}}}$     will be $\frac{1}{{ϵ}_0}\left[\frac{kq}{nR}\right]$. The value of $n$ is