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NEET 2023 · Potentiometer

Potentiometer question from NEET 2023

Q44NEET 2023Medium

Potentiometer

The emf of a cell having internal resistance $1\ \Omega$ is balanced against a length of $330\text{ cm}$ on a potentiometer wire. When an external resistance of $2\ \Omega$ is connected across the cell, the balancing length will be:

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Answer: (a)

$l = l_0\dfrac{R}{R+r}$
$l = 330\times\dfrac{2}{2+1} = 220$ cm
So the answer is (a) 220 cm.

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