Null point with \(1 V\) cell comes out to be \(55 cm\) and with \(R =10 \Omega\) it is \(50 cm\)....

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Null point with \(1 V\) cell comes out to be \(55 cm\) and with \(R =10 \Omega\) it is \(50 cm\). What is the internal resistance of the cell? 
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