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
- A$\frac{1}{3}\,V$
- B$\frac{2}{3}\,V$
- C$\frac{3}{2}\,V$
- D$3\,V$
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