Answer –
According to the question statement –
Emf of the cell, E 1 = 1.25 V
Balance point of potentiometer, given by l 1 = 35 cm
In the question, the cell is replaced by another cell of emf E 2.
New balance point of the potentiometer is given by l 2 = 63 cm
We know that the balance condition is given by the relation –