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In a potentiometer experiment of a cell ...

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 ?

A

`=1.57 V`

B

`=1.67 V`

C

`=1.47 V`

D

`=1.37 V`.

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