Physics Question on Current electricity

Question

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 ?

Answer 1

Solution

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

So, the correct option is (A): 60 cm