See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ?
AIPMT 2009, Medium
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Applying Kirchhoff's equation to the loop $A B F E$,
$-\left(i_{1}+i_{2}\right) R-i_{1} r_{1}+\varepsilon_{1}=0$
or $\quad \varepsilon_{1}-\left(i_{1}+i_{2}\right) R-i_{1} r_{1}=0$
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