If the $EMF$ of each cell is $E = 1.5 \text{ V}$ and internal resistance is $r$, as shown in the figure, what is the current $i$ flowing through the circuit (in $\text{ A}$)?

  • A
    $0.51$
  • B
    $5.1$
  • C
    $0.15$
  • D
    $1.5$

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