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  4. 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 ?

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Q. 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 ?

NEETNEET 2021Current Electricity

Solution:

Potential gradient $=\frac{1.5}{36}$ [Initially]
Finally $\frac{2.5}{I_{2}}=\frac{1.5}{36}$
$\Rightarrow I _{2}=\frac{36 \times 2.5}{1.5}=60\, cm$