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NEET 2021 · Potentiometer

Potentiometer question from NEET 2021

Q54NEET 2021Easy

Potentiometer

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

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Answer: (b)

$\frac{E_2}{E_1} = \frac{l_2}{l_1}$ .
$l_2 = 36 \times \frac{2.5}{1.5} = 60\ \text{cm}$ .
So the answer is (b) 60 cm.

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