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A current of 2 A flows through a 2Omega...

A current of 2 A flows through a 2`Omega` resistor when connected across a battery .The same battery supplies a current across 0.5 A when across connected across a 9`Omega` resistor.The internal resistance of the battery is

A

1`Omega`

B

0.5`Omega`

C

`1/3Omega`

D

`1/4Omega`

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