question_answer

Three batteries of emf IV and internal resistance \[1\Omega \] each are connected as shown. Effective emf of combination between the points PQ is -

A) Zero     

B) 1V   

C) 2V       

D) 2/3V

Correct Answer: A

Solution :

\[{{E}_{net}}=\frac{{{E}_{1}}{{r}_{2}}-{{E}_{2}}{{r}_{1}}}{{{r}_{1}}+{{r}_{2}}}=\frac{2-2}{2+1}=0\]