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Physics · PYQ NEET UG 2021
हिन्दीIn a potentiometer circuit a cell of EMF \( 1.5\text{ V} \) gives balance point at \( 36\text{ cm} \) length of wire. If another cell of EMF \( 2.5\text{ V} \) replaces the first cell, then at what length of the wire, the balance point occurs?
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Correct answer · Option D
\( 60\text{ cm} \)
Explanation
Using the relation \( \frac{E_1}{E_2} = \frac{l_1}{l_2} \), we get \( \frac{1.5}{2.5} = \frac{36}{l_2} \), which gives \( l_2 = \frac{36 \times 2.5}{1.5} = 60\text{ cm} \).
