question_answer

If n identical cells of emf \[\varepsilon \]. and internal resistance r are connected in series, then the total emf and equivalent internal resistance of the combination will be:

A) \[\varepsilon \frac{r}{n}\]                       

B) \[\varepsilon ,\,nr\]   

C) \[n\varepsilon ,\,\frac{r}{n}\]                  

D) \[n\varepsilon ,\,nr\]