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

Options

A. `12 Omega`
B. `8 Omega`
C. `16 Omega`
D. `1 Omega`

Answer

B

Explanation

As, `((1-2)/(2))4=((1-3)/(3))8 implies l=6`
Therefore, `r=((1-2)/(2))4=8 Omega`