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 ?

1. 60 cm

2. 21.6 cm

3. 64 cm

4. 62 cm

Doubtly Asked 30 Oct 2026 NEET UG 2021 neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. 60 cm

Key idea: in a potentiometer, EMF \(\propto\) balancing length.

\(\dfrac{E_2}{E_1}=\dfrac{l_2}{l_1}\Rightarrow l_2=36\times\dfrac{2.5}{1.5}=60\) cm. Option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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