It is observed in a potentiometer experi...

It is observed in a potentiometer experiment that no current passes through the galvanometer, when the terminals of the potentiometer, wire. On shunting the cell by a `2Omega` resistance, the balancing length is reduced to half. The internal resistance of the cell is:-

`4Omega`

`2Omega`

`9Omega`

`18Omega`

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