Question

Primary circuit of potentiometer is as shown in the diagram. Find potential drop across the wire AB.

Answer 1

Given,

$V=2v,R_{AB}=10\Omega ,L=10m,$

Potential across AB, $V_{AB}=\frac{R_{AB}}{R_{AB}+1+20}\times V=\frac{10}{10+1+20}\times 2=\frac{20}{31}$ volts