See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it? 1. ε 1 − ( i 1 + i 2 ) R − i 1 r 1 = 0 ε1−(i1+i2)R−i1r1=0 2. ε 2 − i 2 r 2 − ε 1 − i 1 r 1 = 0 ε2−i2r2−ε1−i1r1=0 3. − ε 2 − ( i 1 + i 2 ) R + i 2 r 2 = 0 −ε2−(i1+i2)R+i2r2=0 4. ε 1 − ( i 1 + i 2 ) R + i 1 r 1 = 0 ε1−(i1+i2)R+i1r1=0

 Question:  From NCERT  | NEET 2009   || [Difficult level:Easy] SubtopicKIRCHHOFF'S RULES  || 

:See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?

                                  
1. ${\epsilon }_1-(i_1+i_2)R-i_1{r}_1=0$
2. ${\epsilon }_2-i_2{r}_2-{\epsilon }_1-i_1{r}_1=0$
3. $-{\epsilon }_2-(i_1+i_2)R+i_2{r}_2=0$
4. ${\epsilon }_1-(i_1+i_2)R+i_1{r}_1=0$

Answer: 1. 

${\epsilon }_1-(i_1+i_2)R-i_1{r}_1=0$

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