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A battery of emf 10 V is connected with ...

A battery of emf `10` V is connected with a load resistance of `50` Omega the total power delivered by the battery is `2` W. If load resistance is replaced by R then power delivered is `4` W, the value of R is

A

`10` Omega

B

`15` Omega

C

`30` Omega

D

`25` Omega

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