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A dynamo of emf `varepsilon_(1)=120V` and internal resistance `r=0.5Omega`, and a storage battery of `varepsilon_(2)=110V` are connected to an extenal resistance R. At what maximum value of R will there be no current through the storage battery? How will be the battery operate when the resistance R is large or smaller than the calculated value?

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Correct Answer - `5.5Omega, if R gt 5.5 Omega "the battery will be changed and if" R lt 5.5Omega` the battery will be discharged.

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