See the electrical circuit shown in this figure. Which of the following equations is a correct equation for…
- $\in_1-\left(i_1+i_2\right) R+i_1 r_1=0$
- $\in_1-\left(i_1+i_2\right) R-i_1 r_1=0$
- $\in_2-i_1 \mathrm{r}_2-\varepsilon_1-\mathrm{i}_1 \mathrm{r}_1=0$
- $-\epsilon_2-\left(i_1+i_2\right) R+i_2 r_2=0$
Solution
For loop (3)
$E_1-\left(i_1+i_2\right) R-i_1 r_1=0$
For loop (4)
$-\mathrm{E}_1+\mathrm{i}_1 \mathbf{r}_1-\mathrm{i}_2 \mathbf{r}_2+\mathrm{E}_2=0$
For loop (1)
$E_2-\left(i_1+i_2\right) R-i_2 r_2=0$Asked in: NEET 2009 (Mains)