During an experiment with a metre bridge, the galvanometer shows a null point when
Channel: Doubtnut
Date: 2020-07-12

During an experiment with a metre bridge, the galvanometer shows a null point when the jockey is pressed at `40.0 cm` using a standard resistance of `90 Omega`, as shown in the figure. The least count of the scale used in the metre bridge is 1mm. The unknown resistance is