Question

Two non – ideal batteries are connected in parallel; consider the following statements.
I. The equivalent e.m.f is smaller than either of the two e.m.f.s
II. The equivalent internal resistance is smaller than either of the two internal resistances.

• A. Both I and II are correct
• B. I is correct but II is wrong
• C. II is correct but I is wrong
• D. Both I and II are wrong

Answer 1

The correct option is C II is correct but I is wrong



$\frac{E_{eff}}{r_{eff}}=\frac{E}{r}+\frac{E}{r}$
$r_{eff}=r/2$
${\text{E}}_{eff}=\frac{2E}{r}\times \frac{r}{2}=E$