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See the electrical circuit shown in the adjoining figure. Which of the following equation is a correct equation for it
  • A$E_2 -i_2r_2 -E_1 -i_1r_1 = 0$
  • B$-E_2 -(i_1 + i_2)R + i_2r_2 = 0$
  • C$E_1 -(i_1 + i_2)R + i_1r_1 = 0$
  • D$E_1 -(i_1 + i_2)R -i_1r_1 = 0$
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