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When a resistance of 2 Omega is connecte...

When a resistance of `2 Omega` is connected across the terminals of a cell, the current is 0.5 A. When resistance is increased to `5 Omega`, the current is 0.25 A. the emf of the cell is

A

`0.5 Omega`

B

`1.0Omega`

C

`1.5 Omega`

D

`2.0 Omega`

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