1. Tardigrade
  2. Question
  3. Physics
  4. The figure shows a meter-bridge circuit where X=12 Ω and R=18 Ω. The jockey J is at the null point. If R is made 8 Ω, through what distance will the jockey J have to be moved to obtain null point again?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The figure shows a meter-bridge circuit where $X=12 \,\Omega$ and $R=18\, \Omega$. The jockey $J$ is at the null point. If $R$ is made $8\, \Omega$, through what distance will the jockey $J$ have to be moved to obtain null point again?Physics Question Image

Current Electricity

Solution:

$\frac{A J}{100-A J}=\frac{X}{R}=\frac{12}{18}$
$ \Rightarrow A J=40 \,cm$
After changing $R$ :
$\frac{A J'}{100-A J'}=\frac{12}{8}$
$ \Rightarrow A J'=60 \,cm$
Shifting: $A J'-A J=20\, cm$