In a potentiometer arrangement, a cell of emt $1.25\;V$ 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 $63.0\;cm$, What is the emf of the second cell ?

Question

$\begin{array}{1 1} \text{a. 2V} \\ \text{b. 2.2 V} \\ \text{c. 2.25 V} \\ \text{d. 2.5 V} \end{array}$