In an experiment to measure the internal resistance of a cell by potentiometer it is found that the balance point - Physics - Current Electricity

Question

In an experiment to measure the internal resistance of a cell by
potentiometer it is found that the balance point is at the length
2m when the cell is shunted by a 5ohm resistance, and is at a
length of 3m when the cell is shunted by a 10ohm resistance The
internal resistance of the cell is?

Jyoti Pant · Accepted Answer

Using,r=(l1l2-1) R=(l1-l2l2) RAccording to question,r=(l1-2l2) ×5----(i)and r=(l1-3l2) ×10---(ii)On solving (i) and (ii), we getr=10 ohm

In an experiment to measure the internal resistance of a cell by potentiometer it is found that the balance point is at the length 2m when the cell is shunted by a 5ohm resistance, and is at a length of 3m when the cell is shunted by a 10ohm resistance. The internal resistance of the cell is?