A hollow insulated conducting sphere is given a positive charge of \[10\,\mu \,C\]. What will be the electric field at the centre of the sphere if its radius is 2 meters [CBSE PMT 1998]

• A.                    Zero
• B.                                      \[5\,\mu \,C{{m}^{-2}}\]
• C.                    \[20\,\mu \,C{{m}^{-2}}\]                                          
• D.            \[8\,\mu \,C{{m}^{-2}}\]