A metallic sphere has a charge of \[10\mu C\]. A unit negative charge is brought from \[A\]to \[B\] both \[100\,cm\] away from the sphere but A being east of it while \[B\]being on west. The net work done is

• A.                    Zero
• B.                                      \[2/10\ joule\]
• C.                    \[-2/10\ joule\]
• D.                           \[-1/10\ joule\]