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JEE Main 2022 (25 Jul, Shift 2) · Potentiometer

Potentiometer question from JEE Main 2022 (25 Jul, Shift 2)

Q47JEE Main 2022 · 25 JUL · SHIFT 2Easy

Potentiometer

In a potentiometer arrangement, a cell of emf 1.20 V gives a balance point at 36 cm length of wire. This cell is now replaced by another cell of emf 1.80 V. The difference in balancing length of potentiometer wire in above conditions will be ___________ cm.

Numerical answer type. Work it out, then open the answer.

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Answer: 18

$l_2 = l_1 \frac{E_2}{E_1} = 36 \times \frac{1.80}{1.20} = 54\ \text{cm}$ .
Difference $= 54 - 36 = 18\ \text{cm}$ .

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