Question

In a potentiometer arrangement, a cell of emf $1.20\, V$ gives a balance point at $36 \, cm$ length of wire This cell is now replaced by another cell of emf $1.80\, V$. The difference in balancing length of potentiometer wire in above conditions will be _______$cm$

Answer 1

The correct answer is 18
1.2=( Potential Gradient )×36
1.8=( Potential Gradient ) ×x
On dividing, we get
32​=x36​
x=18×3=54cm
Hence difference =54−36=18cm