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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

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 2, as shown in the figure. The least count of the scale used in the metre bridge is 1 mm. The unknown resistance is (A) 60 0.1552 R www. 40.0cm (B) 135 0.560 9092 www. (C) 600.2552 (D) 135 0.2302

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