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 ?

In a potentiometer experiment of a cell of emf 1.25 V gives balancing

1.	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 ?
Answer» `~= 1.57 V` `~= 1.67` `~=1.47` `~=1.37 V` Solution :`E_(1) alpha l_(1)` `E_(1)alpha l_(2)` `(E_(1))/(E_(1)) = (l_(1))/(l_(2)) rArr (1.25)/(E_(2)) = (30)/(40) rArr E_(2) = (5)/(3) = 1.67 V`

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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 ?

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