Question

Two batteries of emf$\varepsilon_{1}$ and$\varepsilon_{2}\left( \varepsilon_{2} > \varepsilon_{1} \right)$ and internal resistances $r_{1}$ and $r_{2}$ respectively are connected in parallel as shown in figure.

• A. The equivalent emf $\varepsilon_{eq}$ of the two cells is between and $\varepsilon_{1}$ and $\varepsilon_{2},$ i.e.$\varepsilon_{1} < \varepsilon_{eq} < \varepsilon_{2}$ .
• B. The equivalent emf $\varepsilon_{eq}$ is smaller than $\varepsilon_{1}.$
• C. The $\varepsilon_{eq}$ is given by $\varepsilon_{eq}$= $\varepsilon_{1} + \varepsilon_{2}$always.
• D. $\varepsilon_{eq}$is independent of internal resistances $r_{1}$ and $r_{2}$

Answer 1

Answer: (A)

The equivalent emf $\varepsilon_{eq}$ of the two cells is between and $\varepsilon_{1}$ and $\varepsilon_{2},$ i.e.$\varepsilon_{1} < \varepsilon_{eq} < \varepsilon_{2}$ .