In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 52 cm of the potentiometer wire. If the cell is shunted by a resistance 5$\mathrm{\Omega }$, the balance point is found at 40 cm of the wire from the same end. The internal resistance of the cell is

• A

  1 $\mathrm{\Omega }$

• B

  1.5 $\mathrm{\Omega }$

• C

  4 $\mathrm{\Omega }$

• D

  5.2 $\mathrm{\Omega }$