Question

In a potentiometer experiment it is found that no current passes through the galvanometer when the terminals of the cell are connected across `0.52 m` of the potentiometer wire. If the cell is shunted by a resistance of `5Omega` balance is obtained when the cell connected across` 0.4m` of the wire. Find the internal resistance of the cell.

Answer 1

Correct Answer - A
`r=R(l_1/l_2-1)`
`=5(0.52/0.4-1)`
`=1.5Omega`