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.

Options

A. v
B. `sqrt3 v`
C. `(2)/(sqrt3) v`
D. `(v)/(sqer3)`

Answer

C

Explanation

From COLM
`mv_(2) = sqrt((mv^(2)) + (m (v)/(sqrt3))^(2)) rArr v_(2) = (2v)/(sqrt3)`