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  4. The figure shows a potentiometer arrangement used to measure the internal resistance of the cell B. The null point Q is located at 20cm from point P on a 100cm wire PR. Find the internal resistance of the cell B. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-0w76i9u4ofsnhfze.jpg />

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Q. The figure shows a potentiometer arrangement used to measure the internal resistance of the cell B. The null point $Q$ is located at $20cm$ from point $P$ on a $100cm$ wire PR. Find the internal resistance of the cell $B.$
Question

NTA AbhyasNTA Abhyas 2022

Solution:

$\frac{5 R}{20 + R}+5=4$
$\frac{5 R}{20 + R}=1$
$20+R=5R$
$4R=20$
$R=5$