The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of \[2\,\Omega \] is connected as a shunt with the cell, the balance point is obtained at \[100\,cm\]. The internal resistance of the cell is [MP PET 1993]

• A.                                                      \[0.1\,\Omega \]                
• B.            \[1\,\Omega \]
• C.                    \[2\,\Omega \]
• D.                                      \[0.5\,\Omega \]