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The current $I$ through resistance $\mathrm{r}$ in the circuit shown in the figure is


 

  1. $\frac{-\mathrm{V}}{12 \mathrm{R}}$
  2. $\frac{\mathrm{V}}{12 \mathrm{R}}$
  3. $\frac{\text{V}}{6 \text{R}}$
  4. $\frac{\mathrm{V}}{3 \mathrm{~T}}$
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