Question

If n cells each of emf $\epsilon$ and internal resistance r are connected in parallel, then the total emf and internal resistances will be:

• A. $\epsilon ,\frac{r}{n}$
• B. $\epsilon ,nr$
• C. $n\epsilon ,\frac{r}{n}$
• D. $n\epsilon ,nr$

Answer 1

The correct option is A $\epsilon ,\frac{r}{n}$

$\frac{1}{Ne{t}_r}=\frac{1}{r}+\frac{1}{r}....ntimes$

$\frac{1}{r_{net}}=\frac{n}{r}{r}_{net}=\frac{v}{n}$

and $emf=ϵ$

Answer $ϵ,\frac{v}{n}$