In a potentiometer experiment, the balancing length with a cell is $560 \, cm$. When an external resistance of $10 \, \Omega$ is connected in parallel to the cell, the balancing length changes by $60 \, cm$. Find the internal resistance of the cell.
- A$1 \, \Omega$
- B$2 \, \Omega$
- C$1.2 \, \Omega$
- D$2.1 \, \Omega$
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