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In a potentiometer experiment the balancing with a cell is at length $240\, cm$. 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$0.5$ 
AIEEE 2005, Medium
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