1. Tardigrade
  2. Question
  3. Physics
  4. In a meter bridge, the balancing length from the left end (standard resistance of 1 ohm m the gap) is found to be 20 cm. The value of the unknown resistance will be.

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. In a meter bridge, the balancing length from the left end (standard resistance of 1 ohm m the gap) is found to be 20 cm. The value of the unknown resistance will be.

ManipalManipal 2000

Solution:

Here: Standard resistance of the wire $ =1\,\Omega $ Length of the wire from the left end $ l=20\text{ }cm $ The value of unknown resistance is given by $ R=\left( \frac{l}{100-l} \right)\times S $ $ =\frac{20}{100-20}\times 1=\frac{20}{80} $ $ =0.25\,\Omega $