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An unknown resistance r si determined in...

An unknown resistance r si determined in terms of a standard resistance `R = 100 Omega` by using potentiometer. The potential difference across r is balanced against `45 cm` length of the wire and that `(r + R)` is obtained at `70 cm` of the wire. Find the value of the unknown resistance.

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The correct Answer is:
`00180.00`
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