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In an experiment to determine an unknown...

In an experiment to determine an unknown resistance, a 100 cm long rets tance wire is used. The unknown resistance is kept in the left gap and a known resistance is put into the right gap. The scale to measure length has a least count 1 mm. The null point B is obtained at 40.0 cm from the left gap. We shell determine the percentage error in the computation of unknown resistance.

A

`0.24%`

B

`0.28%`

C

`0.50%`

D

`0.42%`

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