In a potentiometer experiment, balancing length is found to be for a cell of emf . What will be the…

In a potentiometer experiment, balancing length is found to be $120\text{ cm}$ for a cell $E_1$ of emf $2\text{V}$. What will be the balancing length for another cell $E_2$ of emf $1\cdot5\text{V}$? (No other changes are made in the experiment.)