question_answer

In a potentiometer experiment, the balancing with a cell is at 240 cm. On shunting the cell with a resistance of\[2\,\Omega ,\]the balancing length becomes 120 cm. The internal resistance of the cell is

A)  \[0.5\,\Omega \]                            

B)  \[1\,\Omega \]   

C)  \[2\,\Omega \]                               

D)  \[4\,\Omega \]