When a resistance of 2 ohm is connected ...

When a resistance of 2 ohm is connected across terminals of a cell, the current is `0.5 A`. When the resistance is increased to 5 ohm, the current is `0.25 A` The e.m.f. of the cell is

`0.5` ohm

`1.0` ohm

`1.5` ohm

`2.0` ohm

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