In a potentiometer experiment of a cell of emf 1.25 V gives balancing length of 30 cm. If the cell is replaced by another cell, balancing length is found to be 40 cm. What is the emf of second cell ?

Options

A. `=1.47V`
B. `=1.57V`
C. `=1.37V`
D. `=1.67V`

Answer

D