During an experiment with a metre bridge...

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

`60 pm0.15Omega`

`135pm0.56Omega`

`60 pm0.25Omega`

`135pm0.23Omega`

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