During an experiment with a metre bridge, the galvanometer shows a null point when the jockey is pre

Question

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 meter bridge is 1 mm . The unknown resistance is\

Professor PC Thomas Classes · Answer

(c)\