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In potentiometer experiment, a cell of emf 1.25V gives balancing length of 30 cm

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

Options

(a) ≈1.5V
(b) ≈1.67V
(c) ≈1.47V
(d) ≈1.37V

Correct Answer:

≈1.67V

Explanation:

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