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A cell of e.m.f E is connected across a ...

A cell of e.m.f E is connected across a resistance r. The potential differene between the terminals of the cell is found to be V. The internal resistance fo the cell must be

A

`(2(E-V)V)/r`

B

`(2(E-V)r)/E`

C

`((E-V)r)/V`

D

`(E-V)r`

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