In a potentiometer arrangment, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm`, what is the emf of the second cell ?

Explanation

The potential gradient remain the same, as no change in the setting of standard circuit.
`(E_(1))/(E_(2))=(l_(1))/(l_(2))`
`(1.25)/(E_(2))=(35)/(63)`
`E_(2)=2.25V`