For a cell of e.m.f. 2 V , a balance is ...

For a cell of e.m.f. 2 V , a balance is obtained for 50 cm of the potentiometer wire. If the cell is shunted by a `2Omega` resistor and the balance is obtained across 40 cm of the wire, then the internal resistance of the cell is

`0.25Omega`

`0.50Omega`

`0.80Omega`

`1.00Omega`

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