If a charged spherical conductor of radius \[10\,cm\]has potential \[V\] at a point distant \[5\,cm\] from its centre, then the potential at a point distant \[15\,cm\] from the centre will be [SCRA 1998; JIPMER 2001, 02]

• A.                    \[\frac{1}{3}V\]
• B.                                      \[\frac{2}{3}V\]
• C.                    \[\frac{3}{2}V\]
• D.                                      \[3V\]