In a potentiometer experiment, a cell of emf gives a balance point at mark of the wire. If this…

In a potentiometer experiment, a cell of emf $1.25\text{ V}$ gives a balance point at $35\text{ cm}$ mark of the wire. If this cell is replaced by another cell, the balance point is at $63\text{ cm}$ mark. Calculate the emf of the second cell.