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An ideal cell having a steady emf of 2 v...

An ideal cell having a steady emf of `2` volt is connected across the potentiometer wire of length `10m`. The potentiometer wire is of magnesium and having resistance of `11.5Omega//m`. An another cell gives a null point at `6.9m`. If a resistance of `5Omega` is put in series with potentiometer wire, find the new position of the null point.

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7.2 m
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