In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a \[5\,\Omega \] resistance; and is at a length of 3m when the cell is shunted by a \[10\,\Omega \] resistance. The internal resistance of the cell is, then [Haryana CEE 1996]

• A.                    \[1.5\,\Omega \]
• B.                                      \[10\,\Omega \]
• C.                    \[15\,\Omega \]         
• D.            \[1\,\Omega \]