NEET 2021 · PhysicsPotentiometerPrevious Year Question

In a potentiometer, a cell of emf 1.5 V balances at 36 cm. If a 2.5 V cell replaces it, the balance length is:

Answer: (C) 60 cm. \textbf{Answer:} (3) 60 cm \textbf{Solution:} E $_{1}$ /E $_{2}$ = ℓ $_{1}$ /ℓ $_{2}$ $\Rightarrow$ 1.5/2.5 = 36/ℓ $_{2}$ $\Rightarrow$ ℓ $_{2}$ = 60 cm.

A.64 cm
B.62 cm
C.60 cm✓
D.21.6 cm

Correct Answer

Solution & Explanation

\textbf{Answer:} (3) 60 cm \textbf{Solution:} E $_{1}$ /E $_{2}$ = ℓ $_{1}$ /ℓ $_{2}$ $\Rightarrow$ 1.5/2.5 = 36/ℓ $_{2}$ $\Rightarrow$ ℓ $_{2}$ = 60 cm.

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