The storage battery of a car has an emf ...

The storage battery of a car has an emf of 12 V.if the internal resistance of the battery is 0.4`Omega`,what is the maximum current that can be drawn from the battery>

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V=12V,r=0.4`Omega`
For maximum current ,r=R=0.4`Omega`
Current , `I=(V)/( R)=(12)/(0.4)=30A`

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