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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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Knowledge Check

  • A potentiometer having a wire of 4m length is connected to the terminals of a battery with a steady voltage. A leclanche cell has a null point at 1m. If the length of the potentiometer wire is increased by 1m. The position of the null point is

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    D
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  • The wire of potentiometer has resistance 4 Omega and length 1m. It is connected to a cell of e.m.f. 2V and internal resistance 1 Omega . The current flowing through the potentiometer wire is

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