In potentiometer experiment, a cell of e...

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

`~=1.5V`

`~=1.67 V`

`~=1.47 V`

`~=1.37 V`

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