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

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R = x 100 - x 90 ∴ R = 60 Ω d R R = 100 x 100 - x d x ∴ d R = 100 40 60 0.1 × 60 = 0.25 Ω Alternatively d R R = 0.1 40 + 0.1 60 ∴ d R = 0.25 Ω

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