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

  • A
    $4$
  • B
    $2$
  • C
    $1$
  • D
    $0.5$

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