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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 Ω , as shown in the figure. The least count of the scale used in the metre bridge is 1 mm. The unknown resistance is - 40.0 cm R 90 Ω

60 ± 0.15 Ω
135 ± 0.56 Ω
60 ± 0.25 Ω
135 ± 0.23 Ω

Correct answer: 60 ± 0.25 Ω

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